In case you were wondering whose side Drake's on for the UFC 229 Lightweight Championship bout between Conor McGregor and Khabib Nurmagomedov ... this video should clear it up.
The "In My Feelings" rapper seemed to appear on the stage out of nowhere during Conor and Khabib's public weigh-in Friday night in Vegas ... draped in an Irish flag.
After Conor flaunted his fighter bod for the cheering crowd, he got a hug from Drake before the ceremonial face-to-face with his opponent ... which got a little heated.
McGregor clearly violated Dana White's "no touching" rule before giving a high-kick in Khabib's direction. Khabib seemed unfazed. Both fighters made weight earlier Friday.
Saturday night can't come soon enough.
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By the way ... even though it looked like Drake was just all of a sudden onstage supporting Conor, he actually walked in with him.
There must not have been any major Kentucky Basketball events for him to attend instead.
7:00 PM PT -- TMZ Sports got some video of the wild action outside the venue of the weigh-in ... including a dude in a fountain and a bunch of Conor's Irish fans chanting and chugging whisky. Good times.