Derrick Rose just secured the first win at Madison Square Garden this season ... 'cause the hooper proposed to his girlfriend on the court -- and she said, "YES!!"
The Knicks guard shared the awesome news Tuesday night ... posting a photo of him and 26-year-old Alaina Anderson wining and dining privately at half court.
"Just got engaged in MSG nothing major!" Anderson said on IG. "A WIFE!!!! I love you!!!! ud83dude0dud83dude0dud83dude0d MRS ROSE TO YALL LOL"
And, you can't help but notice the absolutely huge diamond ring on Alaina's ring finger!