In coordinated black outfits, Kristen Stewart and Robert Pattinson step out for the hit film's London premiere. Plus: Britney Spears, Taylor Momsen and more

SIGNING BONUS

Signed, sealed and delivered! Taylor Momsen leaves behind a memento at Tuesday's opening of the Rock and Roll Hall of Fame's Annex in New York. The Gossip Girl star mingled with musicians like Blondie's Debbie Harry (not pictured) at the museum's new Big Apple location.