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In February 2007, Caesars Palace opened the Pussycat Dolls Casino located across from the Pussycat Dolls Lounge. It features "Dolls-style" decor and attire for the gaming staff, waitresses and dancers.^[12]

In May 2003, Scherzinger joined the Pussycat Dolls burlesque troupe, who were being re-cast as recording artists. She had first seen them performing on The Late Show with David Letterman in November 2002, where Carmen Electra sang "Big Spender" from the Bob Fosse musical Sweet Charity. In 2006, Scherzinger said "It caught my eye because I’d played Velma Kelly in [Fosse's] Chicago in college."^[5] The Pussycat Dolls now have world-wide status as a popular singing group, with "Don't Cha", "Buttons" and "Stickwitu" as top five hits in the U.S.. The album PCD went double-platinum in 2006. Scherzinger sang nearly all lead vocals on the album, with Carmit Bachar and Melody Thornton also contributing.

In October 2007, Scherzinger appeared on two episodes of UK TV show X Factor Season 4 in which she helped Sharon Osbourne pick her finalists in her home in Los Angeles. Scherzinger also turned up as a member of the audience in the finale of X Factor Season Four. None of the other Pussycat Dolls were present.