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


After performing under the big top and announcing her tour dates, Britney Spears keeps the party going Tuesday night, celebrating her 27th birthday – and the release of her album Circus – in a slinky Roberto Cavalli gown at a party at New York hotspot Tenjune.

See how Britney turned her life around – and look back on more big moments of the year – in our Best of 2008 special!