Victoria Justice attend her 20th birthday celebration hosted by vitaminwater and TWISTER Rave in Los Angeles. (Charley Gallay/Wireimage)

Selena Gomez Sings Revenge Songs To Justin Bieber At UNICEF Concert. (Courtesy Of Youtube, Instagram)

Justin Bieber: New Allegations He Cheated With Second Sexy Model. (Courtesy Of Twitter, Splashnews, Invision/AP Images)

Justin Bieber's New Tweet -- Defending Himself Against Boob Grab? (Courtesy Of Twitter)

Selena Gomez: You've Dissed & Dismissed Justin Bieber -- Now Move On. (Courtesy Of Twitter, Splashnews)

Selena Gomez Reveals Most Cleavage Ever: Shocking Justin Bieber? (Courtesy Of Muse Productions, FameFlynet)

Selena Gomez Tweets Sexy Cleavage Pic -- Tempting Justin Bieber? (Courtesy Of Twitter, FameFlynet)

Selena Gomez Gives Country Star Hunter Hayes Her Phone Number? (Invision/AP Images)

Selena Gomez Is Over Justin Bieber: 'She's Doing Great,' Says BFF. (FameFlynet, SplashNews)

Justin Bieber's Sexy Date Revealed: Meet Ella-Paige Roberts-Clarke. (FameFlynet, SplashNews)

Gucci Mane Gives Rumored Fling Selena Gomez 'Shout Out' In Interview(Invision/AP Images)

Justin Bieber & Mystery Blonde Leave His Hotel Minutes Apart(Splashnews, FameFlynet)

Selena Gomez Disses Justin Bieber's Outfit: I Feel 'Embarrassed' For Him (SplashNews, FameFlynet)

(Mariano Vivacano/Elle UK)

(Mariano Vivacano/Elle UK)

(Mariano Vivacano/Elle UK)

(Mariano Vivacano/Elle UK)

(Mariano Vivacano/Elle UK)