Billionaire   Oprah Winfrey, who went from abused Mississippi farm girl to talk-show host and spiritual leader for millions of daytime TV viewers in search of their authentic selves — not to mention a proper-fitting bra and a good book — is quitting the daily grind after 25 years.

"We gotta land this plane!" she says in her Oprah shout-out way. "Wheels down!"

The last new episode of The Oprah Winfrey Show is set for Wednesday.  Harpo Studios, Winfrey's production company, has not announced who the guests are or what the format will be, which has helped create mystique and build hype.

The price for a 30-second commercial spot on the finale: $1 million, the bill usually charged for a hot prime-time spot.

Oprah's final show airs Wednesday.