Happy birthday Selena Gomez! Justin Bieber's best girl is 20

146498326.jpgOn Sunday (July 21), Selena Gomez celebrates her 20th birthday, though she'll be spending it at the 2012 Teen Choice Awards with boyfriend Justin Bieber, who is nominated for 8 awards and will perform during the annual event. Gomez herself is nominated for three TCAs: Choice Female Hottie and, along with her band the Scene, Choice Music Group and Choice Single by a Group for her song "Hit the Lights."

No word on whether Bieber will lead the TCA crowd in a rousing version of "Happy Birthday to You," but the Bieb has already put his Twitter followers on alert about Gomez's birthday, writing "happy birthday @selenagomez!!! everyone show love!!"

selena-gomez-birthday-braid-fb.jpgIt's been a big year for the former "Wizards of Waverly Place" star -- she launched her own perfume, had a smash single with "Love You Like a Love Song" and filmed the upcoming movie "Spring Breakers" with James Franco.

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So far, Gomez's only acknowledgement of her big day is a picture posted to her Facebook wall with the caption, "early birthday braid :)" 
Photo/Video credit: Getty Images/Facebook