Was There an Undercover Affair on the 'Men in Trees' Set?

“Extra” spotted a smiling Anne Heche Wednesday, and the “Men in Trees” star appeared oblivious to the huge scandal swirling around her.

The TV Guide Channel was on the set of the ABC hit Wednesday, as Anne's rumored affair with her co-star James Tupper exploded.

And on Thursday, “Extra” uncovered the clues that something between James and Anne may have been secretly blooming for some time.

We recently caught Anne out and about without her wedding ring. We also spotted her shopping with her hunky co-star in late December.

In October, Tupper dropped hints as he talked to “Extra” about his steamy on-camera sex scenes with Heche.

“It was really fun to shoot those scenes, I have to tell you,” Tupper admitted. “You wake up in the morning and you say, 'My job today is to go kiss Anne Heche'; that's a pretty good deal.”

Tupper, dubbed “McTreemy,” even told us how his wife was handling the on-set chemistry.

“I did notice that when I got home my wife had bought a new $1,000 dress,” he joked.

But it was no laughing matter when, the very next month, Tupper's marriage fell apart.

Meanwhile, Anne confirmed to us on Wednesday that her 5-year marriage was over, which was a shocking development considering what she had just told “Extra” about their home life.

“It's good, it's really good,” Anne gushed of her stay-at-home hubby and their 4-year-old son, Homer.

“He's the best Mr. Mom I know,” she said.