After two weeks at the top of the box-office chart, "Iron Man" was still doing strong business, grossing an estimated $31.2 million in its third weekend for a running total of $222.4 million, the box-office tracker Box Office Mojo said Sunday.

The Cameron Diaz-Ashton Kutcher romantic comedy "What Happens in Vegas" took in an estimated $13.8 million and has grossed $40.3 million in two weekends.

"Speed Racer" was fourth with $7.6 million, followed by "Baby Mama" with $4.6 million.

The rest of the top 10 were: "Made of Honor," $4.5 million; "Forgetting Sarah Marshall," $2.5 million; "Harold and Kumar Escape from Guantanamo Bay," $1.8 million; "The Forbidden Kingdom," $1 million; and "The Visitor," $687,000.