Revellers at the Outside Lands music festival in San Francisco, California were given a double treat when Black Eyed Peas stars Fergie and WILL.I.AM joined The Dave Matthews Band onstage during their headline performance.
The Grammy Award-winners took to the stage on Saturday night (29Aug09) to close the second day of the event, thrilling the crowd with hits including Ants Marching and Two Step.
But the surprise of the night came when Fergie and joined in the performance for a special rendition of Matthews hit Jimi Thing.
The pair, who played at the event earlier in the day with the Black Eyed Peas, added their own personal touch to the song by blending their MC-ing with the band's jam set.