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Chris Brown and Lil Durk ripped off another artist’s song for their collab “Till The Wheels Fall Off” … at least according to a new lawsuit.

Breezy and Durk are being sued by music producer Micah Foster, who claims CB straight up jacked his track after Micah played it for Chris on a mixtape.

In the docs, obtained by TMZ, Foster claims Chris and Durk’s “Till The Wheels Fall Off” copies the chorus, hook and arrangement for his similarly-titled song “Wheels Fall Off.”

Foster claims he released his song in 2019 … three years before Chris and Durk got together with Capella Grey to record and release “Till The Wheels Fall Off.”

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What’s more, Foster says he’s worked with Chris a ton over the years and played him the song while CB was working on his album “Breezy” … and claims Chris then ripped off the track for a song on his album.

Foster says he’s owed royalties and hasn’t seen a dime … so he’s taking Breezy, Durk and Capella to court to try and get a slice of the pie.

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We reached out to Chris and Durk’s camps … so far no word back.