The website published photos of Michelle "Bombshell" McGee sporting a swastika armband and Nazi hat and said that the letters W and P were tattooed on her legs, which the model claimed stood for White Power.
The new pictures surfaced a day after Bullock's husband Jesse James apologized publicly for the alleged affair. Reports also said that McGee had been paid $30,000 by In Touch magazine for divulging the details of her affair with James, who became a reality TV star thanks to his business of customising motorcycles.
McGee's claims prompted Bullock to cancel plans to attend the London premiere of her hit film The Blind Side and also to leave the family home, according to People magazine.
In a statement to People.com, James, 40, insisted that the "vast majority of allegations reported are untrue and unfounded".
But he went on to accept responsibility for the imbroglio.
"There is only one person to blame for this whole situation, and that is me. It's because of my poor judgment that I deserve everything bad that is coming my way," he said.
"This has caused my wife and kids pain and embarrassment beyond comprehension and I am extremely saddened to have brought this on them. I am truly very sorry for the grief I have caused them. I hope one day they can find it in their hearts to forgive me."
The marital crisis came less than two weeks after Bullock won a best actress Oscar for The Blind Side. In her winning speech, she lavished praise on her husband. Ironically it was while she was away filming that the alleged affair took place.
The incident prompted tabloids to report about an "Oscar curse" that befalls winners of the best actress prize. Previous winners who split from their partners within a year of their victories include Reese Witherspoon, Halle Berry, Julia Roberts and - after her 2009 win - Kate Winslet.
Susan Sarandon, who won in 1996, has also split from her partner.
