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

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

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 ...