Trevor Lawrence Holds Low-Key Bachelor Party In Vegas, Bro-Down At The Tables!

How's the best NFL draft prospect in the country celebrating his final weeks as an unmarried man??

VEGAS, BABY!!!

TMZ Sports has learned Trevor Lawrence hit up Sin City for a low-key bachelor party over the weekend -- bro-ing down at a casino table with his pals and living it up just days before he's set to marry his longtime GF, Marissa Mowry.

A witness tells us the 21-year-old ex-Clemson QB was at Mandalay Bay at around 11:30 p.m. Sunday ... gambling with some buds and keeping his surgically repaired left shoulder safe in a sling.

We're told Lawrence had security to watch his back ... but was super cool with fans who recognized him.

Unclear which game Lawrence was playing and how much cash he was betting ... but don't worry, he can afford to gamble -- as next month's projected #1 overall pick, he's expected to sign a 4-year deal worth around $40 MILLION!!

As for the upcoming nuptials, Lawrence and Mowry -- who have dated since 2016 and got engaged in July 2020 -- are scheduled to tie the knot sometime in early April.