Someone's having a blast down in St. Bart's!

Robin Thicke, 38, and his much-younger girlfriend, April Love Geary, 21, were spotted canoodling by a pool on the Caribbean island this week, soaking up some sun before the new year.

RELATED: Robin Thicke's Much Younger Girlfriend Parades Around in Barely-There Bikini During Trip to the Beach!

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Lucky to be in love with my best friend 😍

A post shared by April Love Geary (@aprillovegeary) on

“Lucky to be in love with my best friend,” April captioned a shot of the duo, though her booty in that skimpy swimsuit is what really caught fans' attentions!

The couple first went public in May following Robin's highly-publicized divorce from wife of 10 years, Paula Patton.

Scroll down to see more photos from April's Instagram and her St. Bart's vacation!