Chris Brown, Justin Bieber Hit the Studio in L.A. [Photos]

Justin-Bieber-Chris-Brown

Singer Chris Brown and Justin Bieber are joining forces for another collabo.  Bieber just wrapped up a successful tour in May and is back in the lab; he was spotted heading into an L.A. studio with Chris on Monday.

The two have collaborated together before–they did a track called “Next 2 You” that debuted at the number ten spot on the Hot Digital Songs chart back in April.