Ashlee Simpson attended the American Ballet Theatre Spring Gala in NYC on May 13, where the 28-year-old singer showed some skin in a stunning Alice + Olivia cutout, backless dress. She topped it off with dazzling emerald earrings and wore her hair back to keep the focus on the sexy cutout.

Ashlee Simpson American Ballet Gala Dress:

Simpson’s dress is edgy and rocker chic, just like her personality! She even added gorgeous emerald earrings to spice up the black dress and make her eyes pop. The lace neckline, sequins, and feathers around her waist added just the right amount of drama to the glamorous gown — and the star pulled off the look flawlessly. While the multi-tasking mom often dresses down and used to be known as a party girl she certainly knows how to clean herself up.

So many other stars joined Ashlee at the Spring Gala. Coco Rocha looked absolutely stunning in a tight pink mermaid dress that formed perfectly to the supermodel’s figure while Lucy Liu was decked out in a beautiful white gown, cropped faux-fur wrap, and sky high nude pumps. Uma Thurman also chose to wear white and she looked so elegant in her classic gown and simple, strappy sandals. Last but not least was model Chanel Iman, who showed up in a dazzling fuchsia gown and was seen lounging on the steps of the theatre.

All of the stars looked amazing, but Ashlee Simpson took the spotlight in her jaw-dropping gown! Do you agree? Do you like seeing the star dress classy on the red carpet or do you prefer her dressed down sense of style?

– Olivia Elgart

More Ashlee Simpson News:

1. Pete Wentz Wants Custody Of Bronx: Ashlee Simpson Partying Too Hard?
2. Christian Siriano Fall 2013 — Perfect For Heidi Klum & Ashlee Simpson
3. Jessica Simpson Vs. Ashlee Simpson — Which Hairstyle Is Tops?

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Fashionista Jessica Simpson, 32, was joined by her adorable baby girl Maxwell and her sister Ashlee Simpson, 28, as she promoted her Girl’s Collection in Charlotte, North Carolina on March 23. The Simpson sisters looked absolutely amazing at the event, especially with their chic hairstyles. Which sister’s hairstyle do you think came out on top?

The feisty Fashion Star coach looked fabulous in her deep red maxi dress and black blazer which complimented her pregnant figure very well.

Ashlee was dressed to impressed at her big sister’s event, sporting a black leather jacket with a short ivory dress that had splashes of green throughout the fabric. Ashlee decided to tied up her beautiful blonde hair in a chic high-bun while Jessica, on the other hand, let her pretty blonde hair flow with some sexy, retro waves. Vote on your favorite sibling hairstyle below!

Jessica’s Sexy Retro Waves — Get The Look

Looking to achieve a sexy, retro hairstyle like Jessica’s? Danny Jelaca from Danny Jelaca Salon in Miami tells HollywoodLife.com readers EXCLUSIVELY how to get the look.

In order to get Jessica’s sexy, retro hairstyle you will need a large barrel curling iron, 8-10 duckbill clips and a finishing spray like Leonor Greyl’s Spray Structure Naturelle.

“Start off the look with a clean blow dry. Taking a large section of hair, keep head tilted down and use a large barrel curling iron to roll ends of the hair forward. Clip in place using duckbill clip. Repeat all over your head. Leave the rolled curls clipped in until cooled — about 5 minutes. After removing clips, use your fingers to shape hair into a forward wave movement. Add the finishing spray to set it,” Danny tells us.

Hey Hollywoodlifers! Tell us which one of these Simpson sister’s YOU think won this hair battle royale in the comments below.

– Brittany Chanel Jackson

More Jessica and Ashlee Simpson News:

1. Jessica Simpson & Eric Johnson Expecting A Boy — Report
2. Pete Wentz Wants Custody Of Bronx: Ashlee Simpson Partying Too Hard?
3. Jessica Simpson Shows Off Curvy Pregnancy Body — Too Much Skin?

Pete Wentz, 33, reportedly thinks that his ex-wife, Ashlee Simpson, 28, is partying too hard since her parents’ recent separation. He allegedly threatened Ashlee’s mother, Tina, saying he will take custody of their four-year-old child, Bronx, if Ashlee doesn’t change.

“Pete is worried that Bronx’s well-being could be affected if Ashlee continues to party hard, and he’s concerned about her right now,” a source told Radar Online. “He spoke with Tina about his concerns and warned that if Ashlee doesn’t get a grip and calm down the partying he won’t hesitate to get a temporary full custody order in place for Bronx.”

Ashlee’s Mother Is Dealing With The Situation

“Tina is heartbroken over the situation. She’s been very hands-on with Bronx and loves spending time with her grandson,” the source continued. “But, with the situation as it is, if Ashlee doesn’t sort herself out soon, Pete believes he will have no option but to go to the courts to get this matter resolved.”

Ashlee Is Burning Herself Out

According to this source, Pete thought in the past that Ashlee was burning herself out and he was completely unhappy about it!

“Ashlee is in the dog house right now with Pete,” a source previously told Radar Online. “He’s concerned that she’s burning the candle at both ends and worried about the effect on Bronx if she continues in this current state.”

“Pete’s told Ashlee that enough is enough, and she has to cut back on the partying.” This sounds serious!

So what do you think, HollywoodLifers? Who should have custody of Bronx?

– Nicole Weaver

More Ashlee Simpson News:

1. Ashlee Simpson & Boyfriend Vincent Piazza Break Up
2. Ashlee Simpson Celebrates Son Bronx’s 4th Birthday
3. Ashlee Simpson: Jessica Simpson’s Baby Maxwell Is ’Spoiled’

Designer Christian Siriano, 27, is no stranger to stars wearing his looks — and he clearly had red carpets in mind big time when he put together his collection of glittering black, red and gold dresses, gowns and formal pant-suits. And yes, it felt like even the black pieces glittered – everything had shine.

Christian believes that women should dress up next fall. Even his day outfits are sexy and have an after-5 look, almost all presented in midnight black.

If you want every eye looking at you when you walk into a room then get ready to slip into his body- slimming shiny black single-breasted short coat with faux fur paneled sleeves and mega faux fur trim worn with bare legs and super  hot gold-laced back boots.

Or how about a gold snakeskin-fabric fitted bomber and matching skirt?

Christian Siriano Reveals What Inspired His Collection To HollywoodLife.com

Liquid gold is a Christian Siriano love and he’s sewn up liquid gold mini day dresses as well as cropped evening pantsuits and strapless gold evening dresses with netted overlays.

For a more formal occasion, Christian has designed a velvety sleeveless black gown with a satin black peplum or an ethereal glittering gold bustier topping a black sparkly netted ballerina-length skirt.

“I wanted it to feel glamorous,” he exclusively told HollywoodLife.com backstage the show. “I was inspired by the Golden Age of Russian Opera, but still wanted it to feel modern.”

Admitting the collection, which had some fully hand-beaded gowns, was “a lot of work,” Christian is proud of his line — as he should be! With a collection this awards-show ready, we won’t be surprised if Heidi, Ashlee and lots of other Hollywooders step out in lots of his sexy looks.

What do you think HollywoodLifers? Let me know.

WATCH: Christian Siriano Fall 2013 Runway: Backstage At New York Fashion Week

– Bonnie Fuller

More Fashion Week news:

1. Rebecca Minkoff Fall 2013 Collection — Perfect For Kristen Stewart
2. Who Was Most Stylish At Fashion Week? Miley Cyrus & More
3. Model Lily McMenamy Walks The Marc Jacobs Runway Topless

It looks like long distance got the better of Ashlee Simpson, 28, and Vincent Piazza, who plays Lucky Luciano on the hit series Boardwalk Empire, as Us Weekly reports that the couple — who began dating a year and a half ago — has decided to call it quits. ”There was no bad blood and no third party involved,” a source close to the couple tells the magazine. “It was honestly just a long distance relationship and it became too hard to make it work.”

But wait, there’s hope!

“It’s not necessarily forever, and they could get back together,” the source adds. “Nobody is to blame. Just the distance.”

Before Vincent and Ashlee started dating, Ashlee was married to Fall Out Boy’s Pete Wentz, 33. In Novemeber 2008, the couple had their first child together, Bronx, who is nearly 4 years old. Two years later the couple split and finalized their divorce in November 2011.

Ashlee recently debuted her new single Bat For A Heart on Nov. 21 so hopefully an album is in the works, which would definitely keep her mind off of her most recent break-up.

We’re glad things could end on such good terms! Do you think Ashlee and Vincent will get back together, HollywoodLifers?

– Julianna Spence

More Ashlee Simpson News:

1. The Best Co-Parenting Celebrities: Reese Witherspoon, Ashlee Simpson, & More
2. Ashlee Simpson Celebrates Son Bronx’s 4th Birthday — Cute Pic
3. Pete Wentz and Bronx Go Pumpkin Picking — So Cute

Not all A-list exes get along for the sake of their kids — Halle Berry and Gabriel Aubry anyone? — but some parents who have split up know the importance of being cordial and spending time together, even after the divorce has finalized.

Jennie Garth and Peter Facinelli split in March 2012 after a shocking 11 years together, but they still manage to keep their relationship friendly for their three kids. The two were even spotted a soccer game for their daughter Fiona, 6, on Nov. 10!

Reese Witherspoon and her ex-husband Ryan Phillippe filed for divorce in 2006, but they also reunite for their kids’ sporting events — the two cheered on son Deacon, 9, at his soccer game.

Sometimes it’s not just sporting events — Ashlee Simpson and her ex Pete Wentz regularly go on family outings with son Bronx just to spend time as a family. How sweet!

What great examples these celebs are setting! Don’t you agree HollyMoms?

– Christina Stiehl

More co-parenting news:

1. Peter Facinelli & Jennie Garth Take Co-Parenting ‘Day By Day’
2. Angela Kinsey: Co-Parenting Daughter Isabel Is The ‘Ultimate Accountability’
3. Courteney Cox And David Arquette Aren’t Letting Their Separation Stop Them From Being Great Parents To Coco

Ashlee Simpson, 28, and Pete Wentz, 33, threw a lively superhero themed birthday bash for son Bronx Wentz, 4, who look thrilled to be celebrating with the family!

Ashlee and Bronx look so alike with those adorable grins! Bronx looked so happy about his birthday party — lucky kid!

Nicole Richie attended the party with her daughter Harlow who dressed as Disney Princess Merida from Brave. Ashlee’s separated parents Tina and Joe Simpson also stopped by, but Joe tried to hide from pics under a hoodie!

Ashlee’s sis Jessica was absent — she’s currently busy promoting her successful fashion line and losing her baby weight!

HollyMoms, do YOU think Ashlee and Bronx are adorable?

– Kristine Hope Kowalski

More Bronx Wentz News:

1. Pete Wentz and Bronx Go Pumpkin Picking — So Cute
2. Pete Wentz’s Son Bronx Inspired His New ‘Do! Do You Like The New Hairstyle?
3. Check Out These Curly-Haired Celebrity Kid Cuties!

Pete Wentz is officially a pumpkin picking expert, as the 33-year-old former Fall Out Boy rocker has made more than one outing to purchase them this week! On Oct. 16, he took his girlfriend Meagan Camper to buy pumpkins, and the following day he was seen buying more with his adorable son Bronx Mowgli at Ralph’s Grocery store in LA.

Pete and Bronx have made several outings together lately, including both a farmer’s market and pet store.

Bronx clearly takes after his dad’s rocker style, but he has his mom Ashlee Simpson’s blond hair.

Pete and 28-year-old Ashlee are a perfect example of a couple who can successfully co-parent. The couple divorced in 2011 after three years of marriage, but can stay amicable for their son. Just last month, they took him to get a haircut together.

But he’s still rocking those blonde curls!

What do YOU think of Ashlee and Pete’s relationship HollyMoms?

– Eleanore Hutch

More Pete Wentz News:

1. Ashlee Simpson & Pete Wentz Want To Reconcile But Joe Simpson Is Getting In The Way!l
2. Pete Wentz Finally Getting Over Ashlee Simpson — Ready To Date Again!
3. Did Joe Simpson Break Up Ashlee And Pete Wentz?