At Katy Perry's Friday night L.A. concert, she welcomed very special surprise guest Rebecca Black to do a duet of Black's song "Friday." Perry introduced her as "the infamous Rebecca Black," which sounds about right.
Black also appeared in the music video for Perry's recent single "Last Friday Night (T.G.I.F.)." They slowed "Friday" down for a brief pairing and shared about a minute-and-a-half of stage time. (I mean, come on, she's still Rebecca Black.) Perry closed the segment by yelling "I love the Internet!"
Watch Katy Perry's "Last Friday Night (T.G.I.F.)":