The star - who fronted an earlier line up of the girl band, and now has a solo career - insisted she did ''probably 95 per cent'' of the vocals on the six-member group's debut album, 'PCD'.
Speaking on a 'Behind The Music' special for TV channel VH1, Nicole said: ''I hope I don't get in trouble for the stuff that I say but I'll never forget I finished the album, 'PCD', and [executive producer] Ron [Fair] and I brought the girls into the studio and we played it for them. It was the first time they'd ever heard the music.
''Do you understand what I'm saying? We played the album for the Pussycat Dolls. It was the first time they'd ever heard the songs.''
He said: ''Melody sang a bit here and there, but the records were Nicole, with the exception of an occasional ad-lib.''
Carmit was first to leave Pussycat Dolls, with Nicole and the rest of the original recording line up following in 2010. A new version of the band is now performing, which has a line up of Lauren Bennett, Paula Van Oppen, Natalie Mejia, Natasha Slayton and Simone Battle.
British pop heartthrobs One Direction became a worldwide sensation when they were thrust together on...
Agents K and J work for the Men In Black, an organisation specialising in hunting...