"It's official. Just left the courthouse!!!!!!! Mr. and Mrs. Ritchie have left the building," says an Aug. 5 diary post titled "Detroit Wedding" on Anderson's Web site. "Off to honeymoon in Detroit! Go Tigers!"
A rep for Anderson confirmed the posting to theshowbuzz.com but said that no further details were available.
Rock, whose real name is Robert James Ritchie, wed a bikini clad Anderson on July 29 on a yacht off Saint-Tropez before some 150 guests. It was "the best most romantic wedding of all time," Anderson wrote on her Web site July 30.
"I'm going to get married a few times this month to the same guy," the 39-year-old actress said at a news conference in July.
Anderson was married to Motley Crüe drummer Tommy Lee on Feb. 19, 1995, and divorced Feb. 28, 1998. They have two children, Brandon and Dylan. Rock has a 13-year-old son, Bob Jr.
Before her nuptials in Saint Tropez, Anderson said on her Web site that she's in love and happy and feels like she's "finally free."
"I've raised my kids alone in hope of a miracle," she said. "Well my miracle came and went. And came back and came back because he knew that I'd wake up one day and realize that I was waiting for nothing."
Anderson said that her children were prepared for the marriage. "They know the truth and they are strong, smart kids," she said. "They love their dad. They love their new step-dad, who they've known for years."
The former "Baywatch" actress was engaged to model Marcus Schenkenberg, but they broke it off in 2001. Later she was engaged to Kid Rock, but they ended their relationship in 2003.
By Amy Bonawitz