After collaborating with the likes of Kanye West and Rihanna, Paul McCartney is continuing to work with a younger generation of influential artists. This time around he's teamed up with Lady Gaga and Pearl Jam guitarist Mike McCready for the soundtrack to a new animated feature he's producing titled High in the Clouds. The film is based off the children's book McCartney co-authored in 2005, and Macca will also voice one of the film's characters, Deadline reports.

Gaga hinted at the collaboration back in February, saying she was working in the studio with McCartney on an unspecified project.

"Had a beautiful session with Sir Paul McCartney and friends. Working on one of his many secret projects! Killer musicians, vibe, and lots of laughs," Gaga captioned a photo on Instagram of herself alongside McCartney, McCready and a room full of instrumentalists. "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!"

In another Instagram post, she recalled the first time she heard from the former Beatle, saying she hung up on him thinking it was a prank call.

"Always a good time with my buddy," she wrote. "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!"

Speaking to the London Evening Standard recently, McCartney said he is "flattered" to be asked by younger artists to collaborate. “The secret is I keep myself very open to suggestions — I still feel like I’m about 30.”

High in the Clouds will be directed by Cloud With A Chance Of Meatballs 2's Cody Cameron. No release date has yet been given. The 3D feature film was first formally announced in September 2013 with a planned 2015 release date, which didn't end up happening. It is also unclear whether McCartney will provide the film's score, though he initially said he planned on doing so.

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