The singer posted a photo from the beach that sent the "Magic Mike" star's heart racing.
Jessie, 30, posed makeup free in a black bikini with a black mesh coverup next to several plates of snacks.
"Fresh face trying to be the life of the Pattie 🇯🇲 I WANT TO LIVE HERE FOREVER 🇯🇲 #hairbyalishaandeduardo
I joke I joke I created this frizzy mess by myself with the sea air as my assistant," she captioned the snap.
Tatum, 38, commented on the snap, "Hottest Instagram food model in the game right now."
Tatum and the "Bang Bang" singer have been dating since about October.
They went public a month later when Tatum gushed about Jessie's performance at London's Royal Albert Hall on his Instagram.
The "21 Jump Street" actor and ex-wife, Jenna Dewan, separated in April after nine years of marriage.