They might be a done deal, but it looks like Casper Smart just can't stop thinking about his ex-girlfriend, Jennifer Lopez. The back-up dancer shared a very special photo and message for Lopez on his Instagram account for her birthday this past week.

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Smart, who wasn't invited to Lopez's star-studded birthday bash in the Hamptons last Thursday, sent her a sweet message, with many people speculating that he might not have gotten over their break-up just yet.

"Happpppppy Birthday to the most Beautiful lil bear in the world!!! May all your wishes come true!!! @JLo," Smart wrote, alongside a photo of a bear-shaped cake.

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Just recently, there were reports that indicated Lopez might have had a "meltdown" following her break-up with Smart.

The singer and actress, who dated Smart for three years following her split from ex-husband Marc Anthony, is said to have been so devastated about the split that she began destroying pieces of her home.

"Jennifer recently had a complete meltdown," a source tells In Touch Weekly. "She started throwing framed photos of Casper against the wall - there was broken glass everywhere, and the maid had to clean up after her. It was a crazy scene."

The two apparently broke up after rumors surfaced that Smart was cheating on Lopez with a transsexual model earlier this summer.

Tags: Jennifer Lopez Casper Smart