Patrick Mahomes‘ wife, Brittany, really is a bikini model now — the Sports Illustrated Swimsuit rookie put her stunning body on display during her vacation in Mexico … and flaunted some serious underboob in the process.

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The Kansas City Chiefs superstar and his longtime partner had a romantic trip in Cabo San Lucas over the past several days … but on Sunday, it was all about the girls.

Brittany was spotted on a luxurious yacht with at least four other ladies … soaking up the sun as they lounged on the back deck.

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Britt rocked a tiny, orange two-piece for the occasion … which is something she’s quite accustomed to lately, as she was named to SI’s newest swimsuit issue back in February.

No word on what all the ladies got into … but chances are they had Taylor Swift‘s new ‘Tortured Poets Department’ album blaring on the speakers, considering Brittany was super pumped for Travis Kelce‘s girlfriend when the project dropped.

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It was quite the eventful trip for the Mahomeses — as we previously reported, the couple was heckled by Raiders fans while out at dinner together last week.

But all good things come to an end … and same goes for the trip — after all, the next football season will be here before ya know it.