The 'Oops I Did It Again' singer marked her man's big day by presenting him with a couple of beautiful horses on Tuesday (30 December).
Britney shared a few photos of herself and Charlie in a stable alongside the caption: "Birthday horses for the birthday boy."
We're taking that to mean she bought the horses (or stable!) for him rather than just took him riding. We could, of course, be wrong!
Britney also splashed out on a pretty impressive looking birthday cake, which featured photos of herself and Charlie alongside pictures of iconic Hollywood couples.
"I believe it's clear that I won the birthday cake war," said Britney.
Yes, we'd probably agree!
Britney, 33, and Charlie, 32, were first linked at the start of November, with Britney later saying he was "special" to her.
She celebrated Christmas with Charlie and her sons Sean Preston and Jayden James, sharing a sweet snap of the foursome together beside a beautiful Christmas tree.
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