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

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WALK THIS WAY

Mariah Carey is gallantly escorted by husband Nick Cannon to their limo after she reportedly had dinner with a male friend Tuesday at Beverly Hills eatery Mr. Chow. The singer recently denied rumors that she was pregnant during an appearance on Ellen DeGeneres's talk show.