PHOTO: Lady Gaga Crowd Surfs at Lollapalooza

08/07/2010 at 05:00 PM EDT

PHOTO: Lady Gaga Crowd Surfs at Lollapalooza
Justin Tranter and Lady Gaga

Lady Gaga

Lady Gaga

Surprise, it's Lady Gaga!

The singer, who just broke a VMA record by earning 13 nominations in a single year, made an unexpected appearance on stage with Semi Precious Weapons at Chicago's Lollapalooza music festival on Friday.

Gaga came on stage and played drums during the song "Magnetic Baby," then joined frontman Justin Tranter for some crowd surfing.

"If anyone calls Lady Gaga a pop star I'll f–ing kill them," Tranter said. "She is a rock star and she is helping Semi Precious Weapons bring rock and roll back."



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