Bethenny Frankel  might have denied they were anything more than friends, but there's no fudging this: Things are REALLY heating up between the reality show star-turned talk show host and billionaire Warren Lichtenstein, as the pair vacation together in St. Tropez in southeastern France.

A source told Breaking Celebrity News that Bethenny, 42, and the hedge funder manager have been daing since earlier this year!

But, an insider revealed, "Bethenny doesn't want to go public with the relationship because her divorce to husband Jason isn't yet finalized.

"She feels that it would alienate her fans if she confirmed the relationship, since it happened so quickly after the split from Jason. The relationship became romantic after Bethenny filed for divorce and she has been spending all of her free time with Bryn at Warren's apartment. Jason is still living in their Tribeca apartment. It's very stressful."