A slew of acts including Lady Gaga and Bruno Mars have been confirmed to play this year's Summerfest.

The massive eleven day event is due to take place in Milwaukee from June 25 to July 6.

Eight headliners have been confirmed to play the Marcus Amphitheater and they include Gaga, Mars, Brad Paisley and Outkast.

They are joined by Dave Matthews Band, Zac Brown Band, Motley Crue and Fall Out Boy/Paramore, who are co-headlining.

Other names on the bill include Tegan and Sara, Brand New, New Order and Five Finger Death Punch.

Tickets for the event can be purchased now.

Watch the line-up being previewed below: