She's famous for the Cat Daddy, and now she may be dating a Diddy.

Supermodel Kate Upton and rapper P. Diddy have been spotted sharing a steamy kiss, it's claimed.

An American newspaper alleges the pair locked lips at Club LIV in Miami Beach just a month after the gorgeous catwalk siren announced she was single.

The Sports Illustrated cover girl broke up with Detroit Tigers pitcher Justin Verlander in February but wasted no time moving on.

One onlooker said: “They were kissing, they weren’t hiding it.”

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

    Upton, 20, soon joined Diddy, 43, in the VIP section where they partied together late into the night.

    The two reportedly met in New York on Thursday for an intimate meal at the Bowery Hotel.

    Go to The Sun for more.