Rihanna Joined Eminem Onstage At Lollapalooza! And The Crowd Freaked The F Out!

What a treat!<br/><br/>Attendants of Lollapalooza 2014 were in for an awesome surprise this past Friday when they chose to go to Eminem's stage in Grant Park in Chicago.<br/><br/>That's because a certain Rihanna made a special guest appearance at the show, and the crowd LOVED the surprise! <br/><br/>Especially when RiRi took over the vocals for Eminem's [...]