Rob Gronkowski — NFL Star Hosts Topless Pool Party

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OK, so HE was the one who went topless … but DAMN.

New England Patriots tight end Rob Gronkowski ditched his shirt … and donned a pair of d-bag shades … to host the Hot 100 party at Wet Republic on Vegas this weekend.

Of course, Rob isn”t shy about his ridiculous physique … dude tore off his shirt at a Super Bowl after-party back in February … a move that was highly scrutinized “cause his team had just LOST.

Thanks to our pals at SpyOnVegas.com for the pics.