Taylor Swift has certainly had more than her fair share of celebrity encounters for the average 21-year-old.  Then again, most people her age aren't multi-platinum selling, award-winning globetrotters.

In celebration of Taylor's big birthday, we've assembled a gallery of just some of the famous friends and peers she's been photographed with over the last few years.  You'll see the young sensation with country legends like Kris Kristofferson and Vince Gill, pop stars like Hayley Williams, Hollywood stars such as Kevin Costner and Nicole Kidman, and hip-hop king Jay-Z.