Vikings Star Stefon Diggs Rocks 'Joker' Cleats for Lions Game

Stefon Diggs was one happy man on Sunday -- he and his team beat the Lions at home ... all while wearing a pair of cleats that the Clown Prince of Gotham would greatly approve of.

The Vikings wide receiver turned heads out at Ford Field, not just because he was playing like a stud -- 7 catches and 142 yards by the end -- but probably more for his footwear ... a pair of custom "Joker" cleats,  with Joaquin Phoenix's mug painted on the side.

There was also a recurring theme from the hit movie written in as well ... "Put On a Happy Face."

What makes these Adidas even cooler is the fact that Stefon had them colored in to match the Joker's actual costume from the flick -- when he finally transforms, that is.

BTW, Stefon has a bit of a history of rockin' pimped out cleats -- literally wearing themes from Starbucks to-go cups to SpongeBob memes and almost everything in between. Props to his cleat guy ... always up to date on the latest trends, and with a nice touch.