Justin Bieber Studio Update: One Direction, Usher, Will.i.am Stop By

Justin Bieber 'Believe' Track List: Drake, Nicki Minaj, Ludacris Featured

What happens when two teenage pop music phenomenons collide? Scientists have pondered this question for decades, but they're finally about to find out, as U.K. boy band One Direction and the one and only Justin Bieber shared studio time earlier this week, presumably working on a collaboration for the Biebs' upcoming "Believe" album.

1D's Niall Horan spilled the beans on Twitter on Wednesday night (April 4), writing, "in the studio with our boy @justinbieber last night , its gona sound great!" And after the group's Liam Payne complimented Bieber's new album and advised fans to "expect the unexpected," the Biebs responded with, "Thanks buddy. good chillin with u guys."

Justin Bieber's 'Boyfriend' Debuts at No. 2 on Hot 100

But is Bieber satisfied with a collaboration with a best-selling pop group, whose debut album "Up All Night" made history by debuting at No. 1 on the Billboard 200 last month? Of course not. Bieber revealed on Twitter that he also spent studio time last night with Will.i.am and his mentor, Usher. "Me and [Usher] gotta have a duet on every album. #real" Bieber wrote.

Usher and Bieber previously collaborated on the latter's "Somebody To Love" remix, and performed together at the 2011 Grammy Awards. While Bieber is readying "Believe" for a summer release, Usher's got his own album, "Looking For Myself," due out June 12 on RCA.

Justin Bieber's 'Boyfriend' Lyrics: The 5 Best Lines

Along with 1D, Will.i.am and Usher, Bieber has spent studio time in Miami with artists like Lil Wayne, Drake, Timbaland and Carly Rae Jepsen. "Boyfriend," the first single from "Believe," debuts at No. 2 on this week's Hot 100, scoring the second-highest-ever debut digital sales week with 521,000 downloads sold, according to Nielsen SoundScan.