Ashlee Simpson Rocks Out in Las Vegas

Ashlee Simpson made her way to LAX nightclub in Las Vegas last night to perform her new single at the Luxor Hotel venue.

The "I Am Me" singer and her Fall Out Boy boyfriend, Pete Wentz, posed for photographers on the red carpet before Ashlee made her way in front of the crowd.

In "Little Miss Obsessive," which she premiered on Chicago's KISS FM DreX Morning Show on Thursday, Ashlee returns to rock - duetting with Tom Higgenson, the lead singer of Plain White T's.

And while the first release from her upcoming album, the Timbaland-produced single "Outta My Head", didn't fare so well with the public, Ashlee hopes that her latest release will be the push buyer's need when her new disc drops on April 15th.

Celebrity Gossip

Enjoy the pictures of Ashlee and Pete at LAX nightclub in Vegas (February 23).