Pharrell, Chad, & Shae will be joined by Rhea for their fourth album titled Instant Gratification dropping in 2010.

“Musically, we’re just somewhere else [with her],” Pharrell told MTV News. “The music is now very 3-D. It’s something you have to hear. But you’ll see. We’re definitely somewhere else. I want to leave that impact moment for when you purchase your download and you purchase your CD. 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.”

The Neptunes artist explained Rhea might be petite, at just 5-foot-4, but her booming voice and her classical background blend in with the genre-bending trio of N.E.R.D., also including Chad Williams and Shae.

“Now you have this little Tinkerbell that’s just stepped in and has been amazing,” he said. “It’s made it a fun process. We can go in so many more directions, because we have the vocal support.”