Ryan Seacrest Mocks Jennifer Lopez's Boyfriend Casper Smart

The American Idol host poked fun at J.Lo's beau -- and his own height! -- during Wednesday night's show

Jennifer Lopez seems to be getting more serious with boyfriend Casper Smart -- but pal Ryan Seacrest is finding the humor in their relationship! During an American Idol taping on Wednesday, Smart, 24, showed up to support Lopez, 43, only to take a ribbing from the show's host.

"Which of these three guys is Jennifer's boyfriend?" Seacrest asked the audience during a commercial break, as he pointed out Casper chatting with two friends. "Or is it the one who's shorter than Ryan Seacrest?"

Us Weekly reports that Lopez "doubled over laughing" at Seacrest's self-mocking joke, while her back-up dancer boyfriend "looked a bit embarrassed."And naturally, the audience cheered.

Lopez, who split from husband Marc Anthony in July, has been publicly dating Smart since last fall. At the time, their age difference (and the close timing with J. Lo's separation) led to the conclusion that it was just a rebound fling. But months later, the pair seems to be almost inseparable; in addition to visiting her at work, he's joined her on the awards-show party circuit and vacationed with her kids.

Inevitably, their closeness is now leading to engagement rumors -- which came to a head this week when designer Roberto Cavalli tweeted that he was making her a wedding dress. (Turns out that his Twitter account had been hacked!) But engaged or not, they're certainly not trying to hide their happiness.

"He’s adorable.  But you already see that," Lopez recently told Vogue when asked about Smart. "He’s a good egg.  I don’t want to talk about it too much. It’s my private thing."

"Private" being a relative term, of course!

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