An unexpected contender jumped on Christopher CaldwellMetro Boomin's beat diss against Drake titled "BBL Drizzy."

The Canadian rapper, 37, spit over the beat on Sexyy Red's song "U My Everything" from her new album "In Sexyy We Trust," released Friday.

"Me and the surgeon got history / I changed a lot of girls’ lives for real, they need a new body, they hittin’ me," Drake raps before the beat switches to Metro's "BBL Drizzy."

He continues, "BBL Drizzy, they want a new body, they ask me for it / The last one drunk, he did it for free 'cause I sent over so many passports for him, for real."

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Why are Metro Boomin' and Drake feuding?

Metro and Drake became locked in a feud when Kendrick Lamar dissed the "Certified Lover Boy" rapper on Future and Metro's "Like That" song, released March 22.

Drake then dissed both Lamar and Metro (and other artists including Rick Ross and The Weeknd) in "Push Ups" on April 19.

Lamar responded with his first full diss track, "Euphoria," just over a week later on April 30. In the track, he referenced Sexyy Red and Drake's previous collaborations and alluded to the Canadian rapper seeing women as his "competition."

In "Push Ups," Drake also told Metro to "shut up" and "make some drums" rather than get involved with the feud.

Metro took the advice and released the catchy, snare-heavy beat "BBL Drizzy" on May 5, which has taken social media by storm after the producer promised any artist with the best verse $10,000 and a new beat for free.

The track, sampled from comedian King Willonius' AI-produced song, alluded to longstanding rumors that Drake has had plastic surgery like a Brazilian butt lift.

It's unclear if Drake or Sexyy got clearance from Metro to use the diss beat.

Contributing: Taijuan Moorman