Ciara and Kim Kardashian

Ciara helped BFF Kim Kardashian make a birthday wish, Katy Perry and Russell Brand hid from the paps, Kanye West greeted his NYC fans, Jay-Z launched "Decoded" in Miami, M.I.A. was in the Halloween spirit, Lady Gaga sent a thank-you note, Taylor Swift was pretty in pink, Beyonce proved she has no baby bump and Nick Jonas enjoyed a wholesome game of b-ball. It all happened this week and we've got the pics to prove it.

All Thanks to : www.billboard.com