Ellen and Portia DeGeneres, who recently celebrated their fourth wedding anniversary, are included on the 2012 Forbes list of the world's most powerful couples.

The list of 15 powerful couples is topped by former U.S. President Bill Clinton and current U.S. Secretary of State Hillary Clinton.

“Successful couples make lots of different arrangements; it's not scientific,” Rosabeth Moss Kanter, a Harvard Business School professor and author of SuperCorp, told the magazine. “With a power couple like the Clintons, it was a trade off. She went to Arkansas for him to be governor. He moved to New York with her partly so she could run for Senate.”

Ellen, 54, the host of The Ellen DeGeneres Show, and Portia, 39, who is expected to reprise her role as Lindsay Bluth Funke in the upcoming series return and feature-length film of the early 2000's hit Arrested Development, married in California during the brief 2008 June-to-November window when gay nuptials were legal in the state.

Ellen, who publicly announced in 1997 during the fourth season of her sitcom Ellen that she is gay, wrote in her memoir Seriously … I'm Kidding that the couple decided they don't want children of their own.

“There is far too much glass in our house,” she wrote.