In a performance that got social media buzzing, Katy Perry and Rebecca Black teamed up for a surprise duet of viral hit "Last Friday Night (T.G.I.F.)" at Rebecca Black's Los Angeles concert last night.

Katy Perry reteamed with Rebecca Black last night, and their joining forces is looking to last through Lifetimes - as in Perry's so-named tour. Black, who appeared in Perry's 2011 video for "Last Friday Night (T.

Katy Perry surprises Rebecca Black with an on-stage tour invite for 'The Lifetimes Tour.' Fans can expect sci-fi visuals, aerial stunts, and deep-cut setlists. The tour kicks off May 7.

Katy Perry has teamed up with Rebecca Black for Perry's Lifetimes tour. Black, who appeared in Perry's 2011 video for Last Friday Night, was at the Los Angeles stop on her own Salvation tour on the weekend when Perry joined her for a rendition of that song.

Rebecca Black will be joining Katy Perry on her Lifetimes Tour starting from May, the singers have confirmed. It comes after Katy struggled with ticket sales.

Pop queens Katy Perry and Rebecca Black are making waves again, but this time, it's not about a viral single. The two singers teamed up for a cheeky skit to announce their joint venture, “The Lifetimes Tour,

Fourteen years after ‘Friday’ video made her the target of cruel comments online, the O.C. native will play Honda Center and Kia Forum.

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