Timbaland Assists Ashlee Simpson on "Bittersweet World".

On her upcoming CD Bittersweet World(MP3), due on April 22, Ashlee Simpson worked with dance music hitmaker Timbaland to add some groove to her pop/rock CD. Timbaland worked his magic on three cuts: "Murder," the Pat Benatar-like fist-pumper "Rule Breaker" and the manic "Outta My Head (Ay Ya Ya)."

So far the set has spawned two singles. "Outta My Head (Ay Ya Ya)" was released in late 2007 and Little Miss Obsessive dropped in March.

"Outta My Head" (Remix):


"La La"(Sharp Remix):


Bittersweet World(MP3) is Simpson's third CD. Her debut CD "Autobiography" was a triple platinum seller in 2004. Her 2005 CD "I Am Me" was certified platinum.