The Black Eyed Peas singer is the beauty brand's first celebrity spokeswoman and she says it feels right because she has links to the Markwins Beauty Products Inc.-owned company.
She told WWD: "For me, this is really no risk whatsoever; it has always been a part of my life, so it is natural to me. I like to dive into things that haven't been done before. That keeps me stimulated. Otherwise, life is boring.
"In Hacienda Heights, there were a lot of beautiful chola girls. They wore Wet 'n' Wild. I would watch them put on their eyeliners and lip liners at school. The big thing for the eyeliners was to heat them up and put on the black eyeliners smooth. They would also line their lips with dark lip liner....Their faces were like palettes. I would try to emulate them. Eric Chen, who is the [Markwins] owner, was like 30 seconds to a minute away from me growing up. He saw girls like me stocking up on those lip liners and eyeliners."
Fergie also says she agreed to work with the brand because their products are affordable yet still good quality.
She said: "I like something accessible, something that my fans can afford. It feels good to be a partner with brands my fans can afford because they have helped me get to where I am today. All the brands that I am partnering with my fans can afford."