Tom Brady and Irina Shayk sure seem to be back on after hitting up a party together in Miami -- 'cause the dude literally picked her up right beforehand, and got caught in the act.
The retired QB was back to doing G.O.A.T. things again Friday night in Magic City -- where Art Basel is going down this weekend ... and where a crap ton of celebs are out and about ... including TB12 and Irina, it seems, who were rolling together in Tom's sweet ride.
Check out the pics .