Rebecca Black to join Katy Perry on her 'Lifetimes' world tour

Katy Perry has tapped iconic "Friday" singer Rebecca Black to join her in her "Lifetimes" world tour!

On Instagram, the pair shared a skit showing Rebecca with fake, exaggeratedly large breasts.

"Rebecca Black, I think you're getting too big for these theaters," Katy tells her. "Do you wanna join me on The Lifetimes Tour?"

Rebecca agrees with an "OK."

"We’re going on The Lifetimes Tour. It’s gonna be big," Katy wrote in her post.

In a separate Instagram post, Rebecca shared the show dates she'll appear in and said, "[Katy], I can’t wait to join you on THE LIFETIMES TOUR!!!!"

Katy will kick off The Lifetimes Tour on April 23 in Mexico.

Rebecca will join her starting May 7 in Houston.

To recall, Rebecca starred in Katy's music video for "Last Friday Night (T.G.I.F.)" in 2011.

The Lifetimes Tour is in support of Katy's latest album, "143," which includes the song "Lifetimes."

—JCB, GMA Integrated News