Oprah Winfrey OprahDinnerO.jpgTalk about a "Power Dinner."

Lady O was one of about 100 select guests who got a chance to have a "private dinner" with President-Elect Barack Obama Sunday night.

"It was a buffet dinner, so everything you'd expect in a buffet was there - as someone who's trying to fit into a red hot inauguration dress, a buffet is not my friend," Oprah's friend Gayle King told Entertainment Tonight.

Oprah's long been an Obama supporter.

Some estimates say her endorsement may have garnered the President-Elect as many as one million votes.

Obama may be the new Commander-In-Chief, but Oprah's still got the real power!!