Simone Biles brought her 25th birthday celebration to the sand of Turks and Caicos ... enjoying a romantic walk on the beach, and a private dinner with fiancé Jonathan Owens.
The couple shared some of the bday fun on social media on Monday ... and it looks and sounds amazing.
"Want to wish my beautiful fiancée a happy birthday!!!" Owens said in a sweet message on IG.
"What's a better place to bring it in than paradise ud83eudd2aud83cudf7e."
They were definitely livin' it up on the islands -- the 4x Olympic gold medalist was even surprised with a private dinner on the beach.