"Hot hookup!" screams Star, which contends that Katie has rekindled her long-ago romance with Klein, a guy who once bragged to Elle that he's an "alpha-heterosexual" who only dates "8 to 10s."
According to the tab, the once-hot actor snuck into Katie's New York apartment for "a sexy, super-secret rendezvous."
Oh, and the "vibe was electric," a first for any scene featuring Klein.
"The fling is exactly what the doctor ordered, and reconnecting with Chris is keeping Katie’s mind off of the painful memories of her joyless marriage to Tom," contends a spy. "She is so thankful to have some lust and passion back in her life."
As the word "riiiiiiiiight" slips from your lips, a Katie confidant assures Gossip Cop that the story is a total fabrication and there was no reunion.
As a palate cleanser, click on for more photos of Tom's adventures in paparazzi-surrounded parenting this week in New York ...