The Patriots superstar hit up Surrender Nightclub at the Encore hotel in Vegas last night … and did what Gronk does — got super turnt up and smashed stuff!!!
Sources at the club tell us Gronk arrived around 1AM … pounded champagne straight from the bottle, danced on stage, and showered the crowded with bubbly.
Best part … Gronk SPIKING the football cake … on his brothers head!
Check out the video.