Rihanna and Eminem at the 2014 MTV Movie Awards

April 13: Rihanna and Eminem perform 'Monster' at the 2014 MTV Movie Awards.

Michael Tran/FilmMagic

It's finally here! Almost! After announcing their co-headlining tour waaaaay back in February, Eminem & Rihanna's The Monster Tour kicks off Thursday night at the Rose Bowl in Pasadena, CA.

The typically Twitter-averse Em tweeted a pic of himself and RiRi from their final tour rehearsals, which you can see above. Well, at least she looks like she's having fun.

The Monster Tour stays in Pasadena for four consecutive dates, then heads to Marshall Mathers' hometown for four more shows at Detroit's Comerica Park. After that the duo hit up the MetLife Stadium in New Jersey.

Lollapalooza goers got an advance taste of the Monster Tour when Rihanna made a surprise appearance during Em's headlining Lolla set, delivering "Love The Way You Lie" and "The Monster." Check out footage of the onstage pairing right here.