DIDDY DATING KATE UPTON?

Call them Diddyup!

Here’s a duo that’ll make your heads spin — Kate Upton and Sean “Diddy” Combs are hot and heavy.

After the 20-year-old Sports Illustrated Swimsuit Issue cover girl said she was single on Valentine’s Day and had broken up with star Detroit Tigers pitcher Justin Verlander, she was spotted a little over a month later, on March 24, sucking face with Diddy, 43, at club LIV in Miami Beach.

“They were kissing, they weren’t hiding it,” an eyewitness tells Confidenti@l.

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

The curvy Upton soon joined him in the VIP section and she and the hip-hop mogul stayed together, partying late into the night.

Following their hot hookup in South Beach, the duo met up again in New York, sharing an intimate dinner together at Gemma in the Bowery Hotel on Thursday.

“They were having dinner together,” a source tells us.

Upton, silent on Twitter that day, the next morning tweeted: “Cuddling with my favorite tiger :)” an obvious diss to Verlander, because she linked to a picture of her holding an actual tiger cub in a Bazaar magazine shoot.

Diddy, who has been linked to Cameron Diaz and most recently singer Cassie, was spotted with the latter house-hunting in Beverly Hills in January. The relationship has appeared to have since cooled off.

Cassie, whose last album was released in 2006, posed last year in a GQ spread labeled “Diddy’s Girl.” Last summer she frolicked topless on a yacht with the rapper while on vacation in St. Tropez. Diddy publicly acknowledged their relationship last September, tweeting a picture of her and writing, “I’m a very lucky man #knowthat.”

Upton, the object of every straight man’s desire, spent New Year’s Eve with Verlander at the Ritz-Carlton on St. Thomas.

In other sports crushes, Michigan’s Spike Albrecht hoped to get Upton into his own personal Final Four. The freshman backup, who electrified the crowd at the Georgia Dome in Monday night’s NCAA title game, tweeted afterwards:

“@KateUpton hey saw you at the game last night, thanks for coming out!” Hope to see you again :)

In the game, Albrecht clearly had his eyes on Upton, who was clad in a V-neck T-shirt there.

A rep for Upton says, “They met once a year ago and there’s no further relationship at this point.”

Diddy could be her Daddy!

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