Jenny McCarthy is Singled Out yet again.

Four months after the Love, Lust & Faking It author began dating professional bodybuilder Jason Toohey, a rep for McCarthy announced the couple has broken up.

VIDEO: Jenny McCarthy dishes on her past hookups

"It's true," the rep confirmed to E! News.

McCarthy showed no signs of a broken heart on Saturday, when an eyewitness saw the 38-year-old actress dancing the night away at Hollywood producer Jennifer Klein's holiday party, sponsored by Grey Goose.

PHOTOS: 2010's most shocking splits

When one of McCarthy's pals asked if she had time to catch up, McCarthy said, "'I need a night out. I'll be here for the night for sure! I want to party!'" the onlooker tells "And she did! She danced all night."

PHOTOS: Hot rebound romances

This isn't the first breakup McCarthy endured in 2010: the former Playboy model ended her five-year relationship with comic Jim Carrey in April.

Get more Us! Follow us on Twitter, Friend us on Facebook, Subscribe to Us Weekly