Scherzinger talked about her days with the girl group during her own profile for VH1's Behind the Music.
In a clip, Scherzinger revealed she worked solely on the PCD album - the group's 2005 debut record.
Scherzinger added: "I probably did 95% of the album on my own."
However, former Pussycat Doll Kaya Jones is claiming that Scherzinger became the lead singer for the group because "there was a lot more going on behind the scenes".
Jones told TMZ: "Nicole was always someone who wanted to be in the spotlight and would do pretty much anything to get it.
"To call the other girls in the Pussycat Dolls 'window dressings' is a bit farfetched... every girl in the group was talented," she added.
Scherzinger is currently a judge on The X Factor.
Watch Nicole Scherzinger talk about the Pussycat Dolls below: