First, Paul McCartney teamed up with Kanye West for "Only One," then he worked with Rihanna on "FourFiveSeconds," and now it seems like the former Beatle is working with another major name in the pop music game: Lady Gaga. Tuesday night (Feb. 3) on Instagram, Gaga shared a series of photos teasing a top-secret collaboration with McCartney.

Gaga posted three images of her and McCartney in the studio, also revealing a hilarious incident that occurred when the rock legend first called her up: she hung up on him. "Always a good time with my buddy. I'll never forget when he called me last year to work and I hung up the phone cuz I thought it was a prank!" Gaga captioned a photo of the two together.

A photo posted by @ladygaga on Feb 3, 2015 at 6:00pm PST

She also shared a snapshot with a bigger group of people, where it was revealed that the duo were working on a secret project. McCartney could be helping Gaga on her fourth studio album (she was also spotted working with RedOne a few weeks ago) or it could be for something else entirely, but it's sure to be awesome, regardless.

The final shot lacks star power, but it does contain an expansive shot of the giant studio.

 Studio rat house.

A photo posted by @ladygaga on Feb 3, 2015 at 7:42pm PST

Concrete details on what, exactly, Gaga and McCartney were up to in the studio are unknown, but look for new music in 2015.

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