As detailed in the new issue of Us Weekly, the star, 47, since the summer before last, when he wooed her at a benefit in the Hamptons.
PHOTOS: Katie's life as a single mom What started as a fling, however, has since become a long-term attraction.
And only Us has an exclusive first photo of them holding hands and getting their flirt on with a little game of footsie!
PHOTOS: Unlikely celeb couples The picture, taken in February, offers a rare glimpse into the couple's undercover flirtation.
star, who has quietly been dating businessman Jeff Prescott for several months, stepped out in Philadelphia Friday night to enjoy a romantic night away with her man. News can confirm the twosome drove to Talula's Garden for a cozy dinner together.
A source spotted the pair sitting by the window where they had a leisurely meal.
"She's getting everything from Jamie that she didn't get with Tom." Foxx, for his part, is equally taken with the alum.According to one insider, he even refers to her using the term of endearment "my girl" — as in, "My girl is calling." PHOTOS: Tom and Katie, the way they were For much more on their undercover romance — including exclusive details on their at-home date nights, what their kids know, and how he "cut his roster" of ladies to make her a priority — pick up the new issue of Us Weekly, out now!