Jason Derulo and Luke Bryan Duet 'Want You to Want Me'

"How could I not?" Bryan asked. "This was too much fun."

ByABC News
August 10, 2015, 6:04 PM

— -- Who knew that Jason Derulo and Luke Bryan were friendly?

The two teamed up to duet Derulo's hit "What to Want Me" via the Sing! karaoke app, and Bryan shared the result via social media.

"How could I not, this was too much fun," he wrote. "@jasonderulo , you're a sanging fool. Oh yeahh."

"This is why you're 1 of my fav ppl on the planet!" Derulo added. "Talented af & know how 2 have a good time! Falsetto on point bruh."

Derulo, 25, released his album "Everything Is 4" earlier this summer, while Bryan's latest work, "Kill the Lights," dropped last week.