See Katy Perry, Rebecca Black's Acoustic "Friday" Performance

Entertainment Aug. 8, 2011 AT 3:32PM

YouTube sensation Rebecca Black, 14, joined her mentor Katy Perry, 26, for an acoustic performance of "Friday" in L.A. over the weekend.

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Once they finished their duet, Perry gave Black a hug and told the crowd: "Thank you so much, Rebecca. That was our moment. We love you Rebecca! Give it up!"

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Black recently made a cameo in Perry's "Last Friday Night (T.G.I.F.)" music video. Still riding high on the success of "Friday" (and her current single, "My Moment), Black also picked up a surfboard for Choice Web Star at Sunday's Teen Choice Awards in Universal City, Calif.

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