As Singer and Entertainer Katy Perry continues to tour the United States, she has been pulling a few tricks out of the old bag, and even inviting a few guests onto the stage during her performances. Well this past weekend, the Youtube sensation Keenan Cahill, who has does work with celebs like Usher, Justin Bieber, 5o Cent, and many more was able to join one of his favorite pop icons not only backstage prior to the show, but also able to even join her on-stage during the show!!!

Prior to many of her concerts, Katy has been allowing a few of her most loyal fans to join her backstage in the form of a meet-and-greet. Well, as his luck would have it, Cahill was able to "kick it" backstage with Katy Perry and even film another video with her. Check it out here!!!

Now just when you think that may have been all, it didn't stop here. During the concert, Katy Perry covered the hit song by Whitney Houston, I Wanna Dance With Somebody, and even invited a few of her fans to join her on stage. Again, Cahill would score as he graced the stage with his one of his favorites in the music industry. See what happens when both Katy and Keenan take it to a whole new level LIVE on stage during the show.

Katy Perry's tour makes a stop in New Orleans at the New Orleans Arena on September 8th, 2011.