Is Robin Thicke, 39, officially off the market?

The singer's longtime girlfriend, April Love Geary, sent fans into a frenzy on Instagram when she hinted that the duo had gotten married.

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"His," the 21-year-old simply captioned a photo of her bikini bottoms monogrammed with the initials "ALT" (does that mean the "T" stands for Thicke?!)

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His.

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

Although she's not wearing a ring on THAT finger, the letters were enough to spark wedding rumors that only ramped up when she posted the below pic with her beau.

The couple started dating in 2014 following Robin's split from ex-wife Paula Patton, with whom he shares a six-year-old son.

Scroll through the gallery below for more swimsuit pics of April (there are A LOT!)