AceShowbiz -

Although down one member, The Pussycat Dolls are still keeping their tradition strong by inviting an outsider to perform a raunchy performance with them. The troupe, initially a burlesque group, will welcome "The Hills" reality star Audrina Patridge to join the now-five piece singing and dancing group.

Their performance is set at Luxor Hotel's PURE nightclub, Las Vegas on March 28. Although it is still not clear what part she will be playing, Patridge reportedly will don the same skimpy outfits like the other girls. The act is arranged in coincidence with the celebration of "The Hills" new season that air on March 24.

This tradition has been celebrated by a number of celebrities in the past. Paris Hilton recently celebrated her 27th birthday by treating the audience with raunchy show with the girls in Las Vegas. Others who have taken the stage with The Pussycat Dolls include Carmen Electra and Christina Aguilera.

Meanwhile, it has been confirmed that the group will remain as a five-piece following Carmit Bachar's departure earlier this month. The only original member of the Los Angeles-based burlesque dance troupe will pursue solo career. "I wanted to be the first to tell you that I'm no longer with the Pussycat Dolls but we will always be sisters forever," Carmit announced.

Update: It has been announced that the cast of "The Hills", Lauren Conrad, Whitney Port and Audrina will join Mariah Carey and MTV VJ Lyndsey Rodrigues along with all their fans at the third season premiere event live from Gotham Hall in New York City. Starting at 9 P.M. ET/PT on March 24, fans will have an opportunity to get up close and personal with the cast like never before, while giving viewers a chance to catch up on the latest drama of the last two episodes.