Sam Smith and Boyfriend Brandon Flynn Lock Hands in South Florida

Sam Smith

Holdin’ On Tight

To Boyfriend Brandon Flynn

12/29/2017 8:00 AM PST

EXCLUSIVE

Sam Smith and Brandon Flynn caught some rays Thursday in South Florida … strolling down the street with unmistakable signs they’re a couple.

Sam and the “13 Reasons Why” star grabbed some lunch during the trip to Brandon’s family home for the holidays.

They’ve been together for a few months, but seem to be going strong.  BTW, Brandon’s not as young as he plays on the show — he’s 24 and Sam is 25.