Ariana Grande & Nathan Sykes — Yes, We’re Dating … Sorry Justin Bieber

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Almost is never enough for Ariana Grande and The Wanted singer Nathan Sykes … so they”re going all the way … sources tell our sources, the two are OFFICIALLY dating.

Ariana and Nathan have been canoodling for weeks — and even filmed a steamy music video together for their song “Almost Is Never Enough” — but according to sources close to the couple, they”ve now officially DTR”d.

This means Justin Bieber — who was rumored to be hooking up with Ariana — is completely out of the picture.

Congratulations … on more counts than one.