Justin Bieber agrees to collaborate with Mark Wahlberg

Justin Bieber has learned about musician-turned-actor Mark Wahlberg's vow to rap again only if they make a duet together. And, the teen singing sensation responded to his call for a collaboration, writing on Twitter that it was a great idea.

"Spoke with mark wahlberg... And no joke @mark_wahlberg is beast. The Other Guys was great... We need to make that record. he needs to rap again," Bieber