Oprah Winfrey, Ellen Degeneres

Ellen DeGeneres is going from CoverGirl spokeswoman to Oprah Winfrey's cover girl.

Appearing via satellite on Friday's Ellen DeGeneres Show, Winfrey made a surprise appearance to fulfill a longtime dream of her fellow talk-show queen.

"I am calling to officially invite you on the cover of O," Winfrey announced.

DeGeneres has long lobbied for the cover Winfrey's magazine.

"I can't believe you're serious. I am freaking out right now," DeGeneres said. "My goal is going to be for this to be the biggest-selling issue you've ever had. I want that to happen."

No word on when the issue will hit newsstands, but the ladies have already figured one important detail.

"We will coordinate our outfits so we don't clash and maybe I'll wear pants too," Winfrey said.

"All right," DeGeneres told her. "They're comfortable, Oprah."

Will you buy the issue? And who's your favorite talk-show queen?