sentences:  After the success of their debut album, The Pussycat Dolls released their first video album, "" in 2006 to coincide with the group's headlining world tour.As of 2008, "PCD" has sold nearly 3 million copies in the United States.After a three-year hiatus in hopes to further Scherzinger's own solo career, the group reunited to record their second and final studio album, "Doll Domination" in September 2008.