@justinbieber / Instagram

From Ariana To Lil Wayne -- Justin Bieber Is Cooking Up Something Massive In The Studio

JBiebs has more than a handful of studio snaps with famous people. What is he doing with all of them?

Ariana Grande, Chris Brown, Lil Wayne -- Justin Bieber is racking up a long list of celebrity cameos. And he's putting the clues to his next project right in our hands.

Justin has been slowly revealing his studio friends on Instagram, usually using vague captions like "studio" to keep fans wondering.

My guess? He's compiling features for his next album. He's also been in the studio with Austin Mahone, Birdman, Madison Beer and, most recently, Akon. Of course, he could be singing on other people's songs, but it's more fun to think that he's hoarding these guest appearances for his own massive next album.

Check out the pics below to see who has had a little taste of JB.

Justin And Chris Brown

"Studio, me and CB did 1 for the fans," JB Instagrammed on Monday (June 16). The two have teamed up before (on Brown's "Next To You"), but apparently this new song is for the Beliebers.

Justin And Akon

Akon got in the on the CB/JB action too, as evidenced by this pic.

Justin And Lil Wayne

"Me and Tunechi in the studio." Two months ago, Bizzle was Instagramming lots of YMCMB folks, with one of them being Wayne. The rapper was featured on Bieber's song "Backpack" from Journals before that. What are they cooking up this time?

Justin And Birdman

"Latenite studio flow @justinbieber music amazin @birdman5star RG YMCMB." Continuing with his YMCMB leanings, Birdman flaunted this pic back in April.

Justin With Mack Maine, Birdman And Austin Mahone

Justin wrote a song just for Austin Mahone, a source told MTV News. Again, the Young Money crew got together for a snap while recording in the studio. "What an amazing song last night..The world isn't ready!" Austin wrote.

Justin With French Montana And Kylie Jenner

Fans think this is Justin's arm in the background. What do you guys think?

Justin And YG

At the beginning of June, Bizzle posed with YG.

YG also booked time with Rita Ora later that day.

Justin And Euro

Here he is with Euro, Lil Wayne's YMCMB up-and-comer.

Justin And Ariana Grande

"congrats @arianagrande on your number 1 song. #arianabieberduet ??" he tweeted after "Problem" hit #1 with Iggy Azalea. I wish he wouldn't be such a tease.

Justin And Madison Beer

Beer, also managed by Bieber's manager Scooter Braun, shared a studio space with him. The pics went viral after Selena Gomez supposedly showed up in the midst of the are-they-aren't-they drama.

Justin And Cody Simpson

Last week, Cody tweeted that he recorded a song with Justin, and then posted the following Instagram video.

Could this be it?