The 'Stros superstar bolted from all the drama in Texas this week to get in a sick island vacay with his smokin' hot GF -- proving no matter what's going down in Houston, he's still winning!!!

The third baseman joined up with his GF, Reagan Howard, and his Astros teammate, Jake Marisnick (plus some other buds), to hit up St. Barts in the Caribbean ... and there's obviously zero worries about the possibility his 2017 World Series title could now be tainted.

Bregs has been cruisin' around the island with Howard -- soakin' in the beach and the pool and very obviously not covering all parts of his bod with sunscreen.

Looks like great times are being had by all!!!

Of course, back home in Houston ... things are going less swimmingly. The Astros have launched an investigation into claims they stole signs during the 2017 season.

Bregs has yet to comment on the matter ... but seems he's pretty comfortable letting these pics do all the talking for him.

And, hey, if the team DID cheat during 2017 ... it's not like Alex should care all that much -- 'CAUSE HAVE YOU SEEN HIS GIRLFRIEND?!?