Linda, Oprah and Bethany

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All dressed up with somewhere to go, Oprah began to have second thoughts about crashing a stranger's wedding.

"We started to have doubts about it," she says. "I did for sure. ... I wasn't so sure that they were going to be happy to see us, and I wasn't so sure that we weren't going to get thrown out and have a really, highly embarrassing moment."

Oprah summoned her courage and arrived at the reception of the first unsuspecting couple—Bethany and Morgan. Oprah greeted the bride and groom, visited with the mother of the bride and then had a sudden realization—they didn't believe she was really Oprah Winfrey!

"I'm really Oprah," she said.

"You're not really Oprah," said Linda, the mother of the bride. "I think I've had too much to drink."

"I really am!" Oprah said as she took off her wide-brimmed hat to show the wedding guests that she wasn't a phony. As a final test of authenticity, the bride's father asked Oprah what her time was in the Chicago marathon she ran years ago. Thankfully, Oprah still remembered. "4 hours, 29 minutes and 30 seconds," she said.