Confirming long-circulating rumors, Madonna [ tickets ] has announced that she plans to tour this summer--though the exact details still remain unknown.

Madonna made the announcement while appearing on Thursday's (2/9) episode of the syndicated television talk show "The Ellen DeGeneres Show."

"You have a huge announcement that I'm so excited about," DeGeneres said, prompting Madonna [ tickets ] to quip, "No, I'm not pregnant."

Madonna added: "Um, OK, I can't hide it anymore. I'm going on tour this summer."

Madonna hasn't toured since 2004's hits-oriented ReInvention tour. Speculation is that her upcoming trek will focus heavily on her latest album, last year's "Confessions on a Dance Floor."