Fergie is dirty and last night as she helped celebrate the former Guns N 'Roses and current Velvet Revolver guitarist Slash's 43rd birthday.

Dragging his actor / girlfriend Josh Duhamel throughout the night in Las Vegas, the Black Eyed Peas frontwoman took to the stage next to the legend of the guitar at a concert in Bare Pool & Lounge outside The Mirage Hotel and Casino.

Following its performance, Fergie jumped off stage - Transformers join his star hubby as attendees mingled with fellow party.

Following up on the birthday concert, there is another game scheduled for this afternoon (July 24) at JET nightclub - with an acoustic performance of slash followed by DJ spinning music will.i.am.