Katy Perry teamed up with Rebecca Black to perform 'Last Friday Night (T.G.I.F.)' and invited her on the Lifetimes Tour.

Katy Perry was a judge on ‘American Idol’ for seven years until she announced she was leaving the singing competition in ...

In a performance that got social media buzzing, Katy Perry and Rebecca Black teamed up for a surprise duet of viral hit "Last ...

Pop star Katy Perry will fly to space this spring as part of a six-member, all-female crew with Blue Origin, the company ...