NiteWatch: Your Guide to Where the Stars & Socialites Were Spotted

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See where the stars ended up last night.

• Documentary filmmaker Morgan Spurlock screened his new film "The Greatest Movie Ever Sold" at E Street Cinema, and Ralph Nader showed up. [Getty]

Janet Jackson again performed for a sold-out crowd at DAR Constitution Hall. [Washingtonian] She hadn't done that since... Tuesday!

• Social media guru Betsy Lowther admitted to the greatness of the new Britney Spears album. [msspinach]

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