Drake opened the door ... Kanye West stepped through it, and then took a few pot shots at Taylor Swift.
Drake brought Kanye out as a surprise guest during his Chicago concert Wednesday night, and he immediately went in on the Taylor beef -- "All I gotta say is, I am so glad my wife has Snapchat!"
'Ye's hometown crowd went wild ... which only fueled him to continue the rant.
Drake looked amused.
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