Michelle McGee is not Jesse James' only Mistress; Thankfully, Sandra Bullock has a Prenup

Tiger Woods must be breathing a sigh of relief as the attention moves to yet another serial cheater.

Apparently, Sandra Bullock's hubby Jesse James cheated on the Oscar winner with other women besides the tattooed model Michelle "Bombshell" McGee, sources tell the Us Weekly.

"This is just the first person who has gone public," one source tells the magazine. Adds another, "This is not an isolated incident. When Sandra is away, he gets bored."

Another home wrecking hot mess, Melissa Smith, has come out and claimed she, too, had a relationship with James  that lasted two years, according to Star.  

Sources tell US Weekly that James' infidelity has been an open secret among employees at his West Coast Choppers bike shop in Long Beach, Calif.

"Everybody knew," the source says.

James, 40, would regularly post Internet ads looking for "hot, tattooed biker chicks with big boobs," says a source.

Adds another source, "He sees their photos, answers the ads and invites the girls to his office."

Apparently it was easy for  Bullock, 45,  to be misled about her husband of nearly five years.

"He is a whole other person when they're together," says a source.

"She was completely duped."

Thankfully, Bullock signed a prenup before their 2005 marriage!

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