Rob Gronkowski: My Super Hot Oscars Date ... 'We're Just Friends'

Rob Gronkowski is a SINGLE MAN -- telling TMZ Sports his super hot date to the Oscars parties is just his friend ... meaning he's still free to bang whoever the hell he wants.

The woman who was on his arm Sunday night was Jordan Duffy -- a TV reporter/extremely hot lady.

But alas ... no relationship with Gronk, just friends. Sad.

Meanwhile, Gronk hit up a MOVIE PREMIERE Tuesday night -- rolling with his bros and his dad to the Westwood premiere of his brand new flick "You Can't Have It" ... in which Gronk cameos as a cop.

The whole Gronk squad was pumped for the movie -- with Rob joking about winning awards for the role ... and praising Joanna Krupa as a pretty awesome co-star.