[Weekend Stalking] Fergie’s Birthday Cake, 50 Cent Kisses Joan Rivers, Serena In the Sand + More

Fergie partied at Las Vegas’ Mirage, with Ne-Yo, friends and a tricked out cake, for her 37th birthday.

Joan Rivers was spotted behind-the-scenes with 50 Cent, shooting a commercial for his energy drink, Street King.

Serena Williams plays in the sand.

Lenny Kravitz takes a stroll in a Tokyo mall.

Usher visited Washington, DC’s George Washington University for former president Bill Clinton’s annual Clinton Global Initiative.

[Photos: Techie]