`The Late Show` host David Letterman made a prank call to media moghul Oprah Winfrey following a suggestion from Lindsay Lohan.

The actress calls Winfrey her mentor. She suggested the idea of a call to Winfrey.

"I think maybe I should just call her right now. Should we call Oprah," the 27-year-old actress asked Letterman.

The "2 Broke Girls" star encouraged the audience to chant "Op-rah! Op-rah! Op-rah!," prompting Letterman to call Winfrey. "Yes, could I speak to Oprah Winfrey, please?...Hi, this is Lindsay Lohan's secretary," said Letterman to Winfrey over the phone.

When Winfrey asked who the person calling was, the 60-year old TV host said: "It's Dave, Oprah."

When Letterman asked Winfrey, how she thinks Lohan is doing now, she said: "I think she's doing okay."