Rihanna in Givenchy rottweiler tee and Givenchy jacket

Rihanna and her brother, Rorrey, celebrated his 22nd birthday at Whisky Mist nightclub in London. She wore a black wool jacket with leather sleeves and a Rottweiler print sweater, both by Givenchy. She also wore leather track pants by Alexander Wang from his Fall/Winter 2011 collection.