It's a model baby boom! These 8 gorgeous ladies all have one thing in common -- they're pregnant! Who is the sexiest model mama of them all?

With Adriana Lima, Alessandra Ambrosio and Lily Aldridge all announcing their pregnancies within the past year, it's obvious babies are the newest model trend! Even with a growing baby bump, these beautiful ladies can still work a runway.

Married to Bruce Willis, model Emma Heming is expecting a baby girl. This will be the fourth daughter for Bruce! (FameFlynet)

Model-turned-makeup-mogul Josie Maran announced that she's pregnant with her second child in January. (Courtesy of Fit Magazine)

Actor Jason Lee's wife, model Ceren Alkac, are expecting their second child together (and Jason's third). (Photo by Ray Kachatorian/Getty Images)

Jack Osbourne's sister Kelly reportedly can't wait to be an aunt to his baby with pregnant model fiance Lisa Stelly. (FameFlynet)

Model-turned-actress Molly Sims announced in January that she's expecting her first child with hubby Scott Stuber. (FameFlynet)

Also joining the group of pregnant Victoria's Secret models are Lily Aldridge and her rocker husband, Kings of Leon frontman Caleb Followill! (FameFlynet)

Being five months pregnant with her second child didn't stop Victoria's Secret model Alessandra Ambrosio from strutting down the catwalk! Work it! (FameFlynet)

The latest model to announce her pregnancy, Adriana Lima is already the proud mom of daughter Valentina, 2, with her husband Marko Jaric. (Photo by Dimitrios Kambouris/WireImage)

Whether they're playing a love interest or singing the song themselves, these hot ladies make videos better than ever. Check out our favorite music video superstars and tell us who YOU think is the hottest!

What do Kristen Stewart, Selena Gomez and Ashley Benson all have in common? They've starred in some super-memorable music videos! Whether they are singers showing off their toned bodies or movie stars lending support to their musician friends, we love seeing these hot ladies rocking out. Check out our gallery of the sexiest stars and tell us, HollywoodLifers -- who is the hottest music video star? (Courtesy Of Polydor UK, Courtesy Of Hollywood [2], Courtesy Of RCA)

Selena Gomez in "A Year Without Rain". (Courtesy Of Hollywood)

Ashley Benson in Hot Chelle Rae's "Honestly" video. (Courtesy Of RCA)

Beyonce in "Single Ladies (Put a Ring on It)". (Courtesy Of Columbia)

Miley Cyrus in "Can't Be Tamed". (Courtesy Of Hollywood)

Kim Kardashian in "Jam (Turn It Up)". (Courtesy Of Kim Kardashian)

Rihanna in "Umbrella". (Courtesy Of Def Jam)

Kristen Stewart in Marcus Foster's "I Was Broken" video. (Courtesy Of Polydor UK)

Demi Lovato in "Skyscraper". (Courtesy Of Hollywood)

It's a model baby boom! These 8 gorgeous ladies all have one thing in common -- they're pregnant! Who is the sexiest model mama of them all?

With Adriana Lima, Alessandra Ambrosio and Lily Aldridge all announcing their pregnancies within the past year, it's obvious babies are the newest model trend! Even with a growing baby bump, these beautiful ladies can still work a runway.

Married to Bruce Willis, model Emma Heming is expecting a baby girl. This will be the fourth daughter for Bruce! (FameFlynet)

Model-turned-makeup-mogul Josie Maran announced that she's pregnant with her second child in January. (Courtesy of Fit Magazine)

Actor Jason Lee's wife, model Ceren Alkac, are expecting their second child together (and Jason's third). (Photo by Ray Kachatorian/Getty Images)

Jack Osbourne's sister Kelly reportedly can't wait to be an aunt to his baby with pregnant model fiance Lisa Stelly. (FameFlynet)

Model-turned-actress Molly Sims announced in January that she's expecting her first child with hubby Scott Stuber. (FameFlynet)

Also joining the group of pregnant Victoria's Secret models are Lily Aldridge and her rocker husband, Kings of Leon frontman Caleb Followill! (FameFlynet)

Being five months pregnant with her second child didn't stop Victoria's Secret model Alessandra Ambrosio from strutting down the catwalk! Work it! (FameFlynet)

The latest model to announce her pregnancy, Adriana Lima is already the proud mom of daughter Valentina, 2, with her husband Marko Jaric. (Photo by Dimitrios Kambouris/WireImage)

Whether they're playing a love interest or singing the song themselves, these hot ladies make videos better than ever. Check out our favorite music video superstars and tell us who YOU think is the hottest!

What do Kristen Stewart, Selena Gomez and Ashley Benson all have in common? They've starred in some super-memorable music videos! Whether they are singers showing off their toned bodies or movie stars lending support to their musician friends, we love seeing these hot ladies rocking out. Check out our gallery of the sexiest stars and tell us, HollywoodLifers -- who is the hottest music video star? (Courtesy Of Polydor UK, Courtesy Of Hollywood [2], Courtesy Of RCA)

Selena Gomez in "A Year Without Rain". (Courtesy Of Hollywood)

Ashley Benson in Hot Chelle Rae's "Honestly" video. (Courtesy Of RCA)

Beyonce in "Single Ladies (Put a Ring on It)". (Courtesy Of Columbia)

Miley Cyrus in "Can't Be Tamed". (Courtesy Of Hollywood)

Kim Kardashian in "Jam (Turn It Up)". (Courtesy Of Kim Kardashian)

Rihanna in "Umbrella". (Courtesy Of Def Jam)

Kristen Stewart in Marcus Foster's "I Was Broken" video. (Courtesy Of Polydor UK)

Demi Lovato in "Skyscraper". (Courtesy Of Hollywood)