Jenny McCarthy, Jason Toohey

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Jenny McCarthy is a single lady—again.

A rep for the blond mom of one confirms...

She and her Las Vegas boyfriend Jason Toohey have split up after four months of dating. "It's true," McCarthy's rep tells us.

The romance began shortly after McCarthy and longtime beau Jim Carrey called it quits. The newest split was first reported by celebrity tabloid In Touch.

McCarthy isn't letting the failed romance get her down.

One Saturday night, she was spotted having a great time at television producer Jennifer Klein's holiday party. McCarthy danced all night with friends—including In Plain Sight star Mary McCormack—and a gaggle of gay guys. "She did dance to 'Single Ladies,' " a fellow partygoer said.

Also at the bash, Taye Diggs enjoyed Grey Goose cocktails before he and wife Idina Menzel headed for the Trevor Project benefit. Jennifer Garner, Eric Stonestreet and Jamie Foxx were also seen dancing and mingling about.

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