Rickie Fowler -- Takes Hot GF to Bahamas ... Battle of the V-Necks

Here's golf champ Rickie Fowler and his hot model GF Alexis Randock ... both showing off their respective cleavages during a celebratory dinner in the Bahamas this week.

Sorry champ, she wins.

The two hit the beach after Rickie won the Players Championship in Florida ... and Randock made sure to let everyone know on Instagram writing, "Dinner on the beach in the Bahamas celebrating my mans huge win!!"

She continued, "Rickie- your hard work and perseverance shined through on Sunday for an epic win that will go down in history. I couldn't be more proud of you!!! #PlayersChampion."