Rihanna’s “Last Girl On Earth” tour hit Los Angeles’s Staples Center last night (it was her first-ever headlining L.A. show), and she was joined by a very special guest:Eminem, who was also in L.A. to shoot the video for his number one hit “Love The Way You Lie” with Ri-Ri.

L.A. audiences can be notoriously jaded, and this particular audience featured famous guests like Gleestars Amber Riley, Chris Colfer, Kevin McHale, and Jenna Ushkowitz–people who are used to seeing A-list celebs around town. But just look at the decidedly unjaded ovation Marshall received when he emerged from beneath the Staples stage floor for his surprise “Love The Way You Lie” duet.

There’s been a lot of talk about how Rihanna’s tour is underselling, but I say if she can get Slim Shady to show up at more of her gigs, she won’t have any trouble filling venues.