Bieber Wants to Rap With Wahlberg - And Ferrell

Justin Bieber has responded to Mark Wahlberg's call to collaborate, insisting he'll record with the actor if they can persuade Will Ferrell to rap on the track.

Wahlberg, who forged a career as rapper Marky Mark before turning to Hollywood, has been trying to get in touch with the 16-year-old pop star because his daughter is a big fan - and he even admitted he would consider coming out of music retirement to duet with Bieber.

But the Canadian sensation will only go through with the project if Wahlberg's The Other Guys co-star Ferrell will join in.

In a series of posts on his Twitter.com page, Bieber writes "Spoke with mark wahlberg... And no joke markwahlberg is beast. The Other Guys was great...

"We need to make that record. he needs to rap again. "Will ferrell needs to rap with us too...that would be...Epic.

I will rap too.

deal?"