To call Tuesday's taping of the two-part Surprise Oprah! A Farewell Spectacular at Chicago's United Center anything less than, well, spectacular, is certainly an understatement.
After all, it's not everyday you see so many celebs gather together to celebrate someone. Then again, not everyone is Oprah Winfrey.
So what did the stars who were on hand have to say about the big shindig?
"I'm glad I came here because it's a fantastic atmosphere," Simon Cowell pointed out.
"It was such top secret news that until I arrived this morning and I saw the list, I was like, are you kidding me?" she said.
What's not so top secret, though, is how Oprah's program managed to endure for 25 years.
"I think it's her spirit," said Madonna. "I think it's the fact that she really is a compassionate human being. She's entertaining, but she wants to help people."
Surprise Oprah! A Farewell Spectacular airs May 23 and May 24, and the final episode of The Oprah Winfrey Show airs May 25.