Rihanna is Surprise Guest Performer For Eminem's Set at Lollapalooza

Check out Rihanna making a surprise appearance during Eminem‘s set on the first day of 2014 Lollapalooza at Grant Park on Friday (August 1) in Chicago, Illinois.

The 26-year-old singer and the 41-year-old rapper wowed the crowd while performing their hit songs “Love The Way You Lie” and “The Monster.” Check out the performances below!

PHOTOS: Check out the latest pics of Rihanna

During the set, Rihanna also sang the female vocals on his 2000 hit song “Stan,” which featured Dido.

This was the first time that Eminem had performed at Lollapalooza since 2011.

Click inside for the rest of Rihanna and Eminem’s performances at Lollapalooza…