Are Kate Upton And Diddy Dating? Diddy Spotted Kissing 'Sports Illustrated' Swimsuit Cover Girl In Miami

*UPDATE* (3:03 P.M.) Diddy just chimed in with a denial of his own, tweeting "Attention all Media. I don't even know Kate Upton personally! I'm not dating her ! What's being reported is not true. END of story!"

*UPDATE* (1:32 P.M.) Upton just tweeted her denial of the rumors that she was seen kissing Sean "Diddy" Combs at a South Beach nightclub. "Really??? Not at all true..," Upton said, referencing the rumors. You can read Upton's tweet here.

Fresh off of her breakup with Detroit Tigers pitcher Justin Verlander, “Sports Illustrated” swimsuit model Kate Upton may be on the rebound with hip hop mogul Sean “Diddy” Combs.

According to an eyewitness, the 20-year-old “Sports Illustrated” cover girl was spotted “kissing” Diddy at a Miami Beach nightclub on March 24, the New York Daily News reports. Upton had broken up with Verlander around Valentine’s Day.

“They were kissing, they weren’t hiding it,” the eyewitness told the Daily News.

Diddy was hosting a party at the trendy night club, tweeting: “Miami ... Ain’t no party like a @iamdiddy party ... Meet me at Club Liv 2nite #CIROCBOYZ in the building!!!”

The voluptuous Upton reportedly joined Diddy in the club’s VIP section, and the two partied together well into the night, the Daily News reports.

Next, the new couple transported their South Beach fling to New York, where the pair was spotted enjoying dinner at Gemma in the Bowery Hotel last Thursday.

“They were having dinner together,” a source told the Daily News.

While Upton has not addressed the rumored romance on Twitter, she did provocatively tweet: “Cuddling with my favorite tiger :),” accompanied by a picture of her holding a tiger cub for a recent Bazaar magazine spread. The tweet may have a subtle dig at ex-beau Verlander.

In the past, Diddy has been linked to “There’s Something About Mary” star Cameron Diaz, as well as singer Cassie, the Daily News reports. While the pair were spotted house-hunting in January, their relationship seems to have sputtered.