A newly single Britney Spears debuted a softer, chocolate-hued ‘do upon arriving at Elton John’s annual Oscars bash in De Grisogono jewels and a plunging, black sequined gown courtesy of Michael Cinco Couture.Jennifer Lawrence arrives at the 2013 Vanity Fair Oscar party on Sunday, Feb. 24 2013 at the Sunset Plaza Hotel in West Hollywood, Calif.Jim Carrey attends Grey Goose at 21st Annual Elton John AIDS Foundation Academy Awards Viewing Party at Pacific Design Center on February 24, 2013 in West Hollywood, California.