The video is pretty fantastic ... Alicia hushes our photog so he doesn't blow the moment, and then Swizz appears with a blindfold firmly secured.

Swizz thought she was taking him to a special restaurant, but in fact they were at World of Wheels, where Swizz had been eyeing a super sweet 2019 Aston Martin Vantage. The cheapest you can get it is $150k.

Check out the surprise ... he's lovin' it.

He apparently had a bum arm and it was hurting bad enough his first drive was to the hospital to get it checked out.