One of Jesse James’ mistresses is said to be pregnant.

The father-of-three, who is presently undergoing rehabilitation for ‘personal issues,’ was reported to be aware of the woman’s pregnancy but kept it a secret from his actress wife.

In an article published today on RadarOnline.com, a source said, “Jesse got a mistress pregnant. Jesse knew about it.”

The mistress, whose identity was not revealed, also did not disguise the fact that she was pregnant, according to RadarOnline, but the baby was never born.

Bullock, 45, was completely unaware of the pregnancy, according to the source.

The unnamed woman was one of four mistresses James was accused of having affairs with during his nearly five-year marriage to Bullock, including tattooed model Michelle ‘Bombshell’ McGee.

According to the National Enquirer, he may have slept as many as 11 women since his marriage to Bullock.

Since word of James’ alleged infidelities surfaced on March 17, the Oscar winner has been in hiding, only being spotted once on Wednesday, concealing her face with a huge sun hat.

Bullock, 45, was photographed fleeing from a swarm of journalists as she paid a visit to her ‘dear friend’ Gabriel Brener at his Beverly Hills mansion.

Joe Yanny, James’ lawyer, told TMZ.com that his client is a “broken man.”

“This whole thing has destroyed Jesse’s entire universe,” he said. “Right now, he’s a broken man.”

Friends say the actress is still reeling from the news and is indecisive about her next step.

‘She’s in shock,’ a pal told People magazine. ‘She’s sad – but getting angrier.’

‘They’re in a celebrity marriage where you really have to trust each other because the opportunities to stray are huge. He was a champ around her. He would make her feel like a million bucks.’

Friends say James is trying to salvage his marriage, and that he assured Bullock he’d get assistance “like Tiger” – a reference to the beleaguered golfer, who has had his own marital problems recently.

Yanny told TMZ that James is still head over heels in love with Bullock.

“The single most important thing to Mr. James and the children is that the marriage somehow survive,” he said.