Christina Aguilera shares a picture of her daughter Summer Rain on January 18, 2015 (Courtesy of Instagram)

Christina Aguilera performs onstage during the Breakthrough Prize Awards Ceremony Hosted By Seth MacFarlane at NASA Ames Research Center on November 9, 2014 in Mountain View, California. (Photo by Steve Jennings/Getty Images for Breakthrough Prize)

Christina Aguilera performs onstage during the Breakthrough Prize Awards Ceremony Hosted By Seth MacFarlane at NASA Ames Research Center on November 9, 2014 in Mountain View, California. (Photo by Steve Jennings/Getty Images for Breakthrough Prize)

Christina Aguilera, Aug. 11, 2014 (Courtesy of Twitter)

Christina Aguilera for V Magazine (Courtesy of Brian Bowen Smith/VMagazine.com)

Christina Aguilera and Matt Rutler (Courtesy of Instagram)

Christina Aguilera, June 21, 2014 (Courtesy of Twitter)

Christina Aguilera and her fiance Matt Rutler take her son, Max Bratman, out to mini golf in Studio City, California on July 12, 2014 (FameFlyNet)

Christina Aguilera & Family Out For Coffee On Mother's Day May 11, 2014 (FameFlyNet)

Christina Aguilera attends 102.7 KIIS FM's 2014 Wango Tango at StubHub Center on May 10, 2014 in Los Angeles, California. (Photo by Frazer Harrison/Entertainment/Getty Images For 102.7 KIIS FM's Wango Tango)

Christina Aguilera performs at 102.7 KIIS FM's 2014 Wango Tango at StubHub Center on May 10, 2014 in Los Angeles, California. (Photo by Gregg DeGuire/WireImage)

Christina Aguilera performs at the New Orleans Jazz and Heritage Festival at the Fairgrounds Race Course in New Orleans, Louisiana on May 2, 2014. (Photo by Bob Krasner/Redferns)

Selena Gomez arrives at the Screening of 'Rudderless' in LA Oct. 7, 2014 (Getty)

Selena Gomez arrives at the Screening of 'Rudderless' in LA Oct. 7, 2014 (Getty)

Selena Gomez arrives at the Screening of 'Rudderless' in LA Oct. 7, 2014 (Getty)

Selena Gomez arrives at the Screening of 'Rudderless' in LA Oct. 7, 2014 (Getty)

Selena Gomez showed off her legs and more while sporting some very short shorts on her way to a meeting in Los Angeles, California on July 31, 2014. (FameFlyNet)

Selena Gomez showed off her legs and more while sporting some very short shorts on her way to a meeting in Los Angeles, California on July 31, 2014. (FameFlyNet)

Selena Gomez showed off her legs and more while sporting some very short shorts on her way to a meeting in Los Angeles, California on July 31, 2014. (FameFlyNet)

Selena Gomez arrives in ZIMMERMANN to the premiere of Mad Chance's 'Behaving Badly' at the ArcLight Hollywood on July 29, 2014 in Hollywood, California. (Photo by Alberto E. Rodriguez/Entertainment/Getty Images)

Selena Gomez arrives at the 'Behaving Badly' - Los Angeles Premiere at ArcLight Hollywood on July 29, 2014 in Hollywood, California. (Photo by Steve Granitz/WireImage)

Selena Gomez with new BFF Cara Delevingne during their trip to St. Tropez on July 24, 2014 (Courtesy of Instagram

Selena Gomez, in Emilio Pucci, at Leonardo DiCaprio Foundation Gala in St. Tropez on July 23 (Courtesy of Getty)

Selena Gomez & Cara Delevigne (Getty Images)

Selena Gomez and her gal pal Cara Delevingne are surrounded by a security team while heading to a party hosted by Leonardo DiCaprio in Saint-Tropez, France on July 23, 2014. (SplashNews)

Selena Gomez and her gal pal Cara Delevingne are surrounded by a security team while heading to a party hosted by Leonardo DiCaprio in Saint-Tropez, France on July 23, 2014. (FameFlyNet)

Selena Gomez and her gal pal Cara Delevingne are surrounded by a security team while heading to a party hosted by Leonardo DiCaprio in Saint-Tropez, France on July 23, 2014. (FameFlyNet)

Selena Gomez and her gal pal Cara Delevingne are surrounded by a security team while heading to a party hosted by Leonardo DiCaprio in Saint-Tropez, France on July 23, 2014. (FameFlyNet)

Selena Gomez celebrates her 22nd birthday on July 22 in St-Tropez, France (Courtesy of Instagram)

Selena Gomez celebrates her 22nd birthday on July 22 in St-Tropez, France (Courtesy of Instagram)

Selena Gomez continues her birthday celebration, jumping from the Ecstasea yacht in Saint-Tropez, France on July 23, 2014. Selena held hands with Tommy Chiabra as they jumped from the yacht into the water below (FameFlyNet)

Selena Gomez continues her birthday celebration, jumping from the Ecstasea yacht in Saint-Tropez, France on July 23, 2014. Selena held hands with Tommy Chiabra as they jumped from the yacht into the water below (FameFlyNet)

Selena Gomez attends the Day 5 of Ischia Global Film & Music Fest 2014 on July 16, 2014 in Ischia, Italy (FameFlyNet)

Selena Gomez (FameFlyNet)

Selena Gomez (Getty)

Selena Gomez at the Ischia Film Festival on July 18, 2014 (SplashNews)

Selena Gomez attends the Gala Dinner Awards at the Ischia Global Festival in Italy on July 19, 2014 (SplashNews)

Selena Gomez Enjoys Her Birthday listening to Judy Garland while laying on a couch on July 20 (Courtesy of Instagram)

Selena Gomez attends a press conference during the Ischia Global Festival in Italy on July 19, 2014 (SplashNews)

Selena Gomez in Ischia for the Ischia Global Festival Awards on July 18, 2014 (SplashNews)

Selena Gomez posted this picture of her tattoo on July 16, 2014 (Courtesy of Instagram)

Selena Gomez in Miami, FL on July 12 (SplashNews)

Selena Gomez, NYC, July 10, 2014 (SplashNews)

Selena Gomez & Tanz Watson (Courtesy of Twitter)

Selena Gomez in NYC on July 10, 2014 (SplashNews)

Selena Gomez, NYC, July 9, 2014 (Courtesy of Instagram)

Selena Gomez out in NYC on July 9, 2014 (Courtesy of Instagram)

Selena Gomez out in NYC on July 9, 2014 (Courtesy of Instagram)

Selena Gomez out in NYC on July 9, 2014 (Courtesy of Instagram)

Selena Gomez out in NYC on July 9, 2014 (Courtesy of Instagram)

Selena Gomez out in NYC on July 9, 2014 (Courtesy of Instagram)

Selena Gomez out in NYC on July 9, 2014 (Courtesy of Instagram)