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Jennifer Aniston is letting the world know she's in love ... posting a romantic pic with her new boyfriend, Jim Curtis.

The actress took to IG Sunday night ... sharing a black-and-white shot of the two smiling as she wraps her arms around him.

Anniston captions the photo ... "Happy birthday my love. Cherished ❤️"

While the pair have seemingly been together for several months -- with Jennifer “soft launching” their romance in August when she posted a photo taken behind Jim -- this marks the first time she’s publicly confirmed their relationship.

Curtis -- a hypnotherapist and life coach -- showed his support for Anniston back in September, attending the premiere of "The Morning Show." Play video content

Before that, the couple was seen arriving at an NYC hotel after a three-hou

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