Katy Perry faces challenges with ticket sales for her Lifetimes tour and seeks advice from Taylor Swift, whose Eras Tour is a ...

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

Tetris Kelly: Katy Perry just announced she’s heading to space. But before she does, we talk to her about Gaga, her daughter Daisy and how she’s bringing us to her planet on the Lifetimes World Tour.

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 is about to hit the road with her Lifetimes Tour after nearly eight years, and the pop star shares what her fans can expect from the new trek, what the setlist is going to include and more!

As always, the internet didn't hold back when it came to Perry's out-of-this-world announcement. From skeptical digs at her setlist to jabs at her galactic ambitions, Twitter erupted with commentary.