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!

KATY PERRY

After joking on Twitter that she was going to hook up with Justin Bieber at the Kids' Choice Awards, Perry posted this shot of herself smooching the singer. "Told you I would tap that," she Tweeted. "Yummy."