Drake And Serena Williams I'll Have the Tongue Restaurant Makeout Sesh

8/24/2015 12:01 AM PDT

Game. Set. Smash. 

Here it is ... proof Drake and Serena Williams are officially a thing -- making out at a fancy Cincinnati restaurant Sunday night ... and TMZ has the pics. 

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Hours after Serena dominated and won the WTA tournament in Cinci -- with Drake in the crowd -- the two hit up the uber-fancy Sotto restaurant in downtown for some hoity-toity Italian food (the porterhouse is $85). 

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The two had a private room in the back of the eatery -- where they couldn't keep their hands and lips off of each other ... while several patrons watched. 

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People inside the restaurant tell us the two were joined by 6 other people ...and at one point ordered a round of tequila shots for the table. 

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There have been rumors about the two hookin' up for months -- ever since Drake was spotted cheering for Serena at Wimbledon -- but now the pics confirm it ... it's game on.