"Yes, I have filed for divorce," the 45-year-old Oscar-winning actress said in an interview. "I'm sad and I am scared."

Bullock and James, 41, began the adoption process four years ago, the report said, and brought 3 1/2-month-old Louis Bardo Bullock home in January but decided to keep the news to themselves until after the Oscars. The baby was born in New Orleans, the story said.

James and Bullock separated in March after five years of marriage, following reports that James had been unfaithful.

Bullock won the Oscar for best actress for her role in the blockbuster hit "The Blind Side" on March 7. Within days of her win, the cheating allegations became public and Bullock went into seclusion.

The motorcycle mogul publicly apologized to Bullock and his children, Sunny, 6; Jesse Jr., 12; and Chandler, 15.

He recently returned home after a 30-day stay in a treatment facility where he sought help for "personal issues," the story on People's website said.

When asked about whether James had cheated, Bullock said she "had no idea about anything."