Derrick Rose Proposes to Girlfriend At Madison Square Garden, Massive Ring

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!!!! 😍😍😍 MRS ROSE TO YALL LOL"

And, you can't help but notice the absolutely huge diamond ring on Alaina's ring finger!!

Alaina says she wasn't expecting it, even with the private dinner at MSG -- 'cause Rose gave her a promise ring the day before saying, "hopefully one day I can get you the real thing."

Very sneaky, D Rose!!

Rose wrote a poem to his future wife ... saying, "Believe the words that I will have your back and love u forever. When I FIRST saw you I told Ryan that we were gon be together."

"I will always love you becuz you go above and beyond. We built a beautiful family and a unbreakable bond. Thank you Queen."

The lovely couple has reportedly been together since his Chicago Bulls days in 2016 ... and welcomed their daughter, Layla, in 2018 and son, London, in 2019.