In the grandest romantic gesture since Seth from The O.C. jumped on a coffee cart, Adam Levine serenaded wife Behati Prinsloo on their anniversary. We know, we know, he's a singer and all, but his surprise performance at the restaurant where they married is made all the sweeter by its spontaneity - and her bashful what-are-you-doing-this-is-so-cute-but-embarrassing grin.

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Celebrating one year of marriage at Flora Farms in Cabo last weekend, Adam finished his dinner, jumped up on stage, and belted out Marvin Gaye's Let's Get It On. We always knew that the pretty pair was pretty damn adorable, but they've definitely pushed the relationship goals factor up a few levels here.

For her part, Behati laughed, looked gorgeous and did some chair-dancing, while the crowd cheered Adam on and - judging by this video - whipped out their camera phones.

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Since this glorious, gorgeous night, Adam has gone for an anniversary haircut. And by haircut, we mean he's shaved off every inch of his brunette hair. He shared the chop on Instagram with his wife sat by his side, and the caption: "She's into me…I think…"

Well, if she wasn't before, that Marvin Gaye rendition would seal it...

Story via NBC Bay Area. From the editors of cosmopolitan.co.uk

From: Cosmopolitan UK