Justin Bieber's Party Pals

Kim Kardashian! Katy Perry! See the stars sure to wish the singer a very happy birthday when he turns 17 on March 1!

  • RIHANNA
 photo | Justin Bieber, Rihanna

Credit: Courtesy Justin Bieber

Updated: Tuesday Mar 01, 2011 | 06:00 AM EST By: Cara Lynn Shultz

RIHANNA

"It's always love," Tweeted Bieber while grabbing dinner with Rihanna. The teen pop star apparently gave Rihanna more than she bargained for: "Justin Bieber just flashed me his abs in the middle of a restaurant! Wow! He actually had a lil 6-pack! Sexy, lol!" Rihanna Tweeted.