With earnings of $110 million in 2008, Madonna topped Forbes’ list of Hollywood’s hardest working mothers, followed by actresses Reese Witherspoon and Gwyneth Paltrow.

The pop singer and mother of three, who was recently turned down in her bid to adopt a second child from Malawi, grossed $105 million on her tour and sold nearly a million albums in the United States. Madonna also signed several lucrative endorsement deals last year, according to Forbes.com.

“She had an incredible year in 2008,” said Lauren Streib who helped to compile the list that was released on Friday.

“She had the top tour of any musician…The tour sold out around the world. So it wasn’t surprising as much as it is a commentary on how successful her year was,” she said.

Source: Reuters