Britney Spears headed to Las Vegas last night for two surprise shows at the Palms. The star announced the concert through her Twitter account: "Looks like my little secret isnt a secret anymore. Whos coming to watch me take the stage TONIGHT at @RainLasVegas at @PalmsLasVegas?" she tweeted. The American pop star first performed a private show at 8 pm, followed by a midnight performance open to the public. Britney performed three songs at Rain nightclub for more than 1,000 fans who paid $60 a ticket to see her. She sang her first single off her latest album Femme Fatale "Hold It Against Me," as well as "Till the World Ends" and "Big Fat Bass".