She’ll now appear on the band’s fourth album Instant Gratification- which will be released in 2010.
Speaking to MTV News in the States mainman Pharrell said: “Musically, we're just somewhere else [with her]. The music is now very 3-D. It's something you have to hear. But you'll see."
He continued: “The music is very three-dimensional. We're just really excited. We feel like N.E.R.D. has always been the punks of hip-hop and the outcasts of alternative music — just a little different. But this time, we're taking no prisoners."
Toronto native Rhea- who has a classical music background- auditioned for NERD over the internet.
She said: “It was just a really good time. When I came in there and I met them and they heard me sing, I think they decided it was the right fit.”