celebrity birthdays

Selena Gomez partied like it was her birthday, or "berfday," this past week, because, well, it was. She's been celebrating the big 2-1 all week long. She is not doing so with her ex Justin Bieber -- they're not together -- but with her gal pals and family. What a crew!

Happy birthday to Selena Gomez! The 'Come & Get It' songstress turns 21 years old today, and she's celebrating the only way a pop star knows how... by releasing a wild party video for her track 'Birthday.'

Here’s a look at some notable birthdays being celebrated today: John Mellencamp Age: 60 Occupation: Singer, Songwriter, and Musician Known For: His catchy, populist brand of heartland rock, selling 40 million albums worldwide, racking up 22 Top 40 hits like ‘Pink Houses’ and ‘Jack & Diane,’ and being one of the founding members of Farm Aid Simon Cowell Age: