AceShowbiz - Halle Berry has dismissed reports she has signed on to play Oprah Winfrey in a rumored biopic about the talk show titan's life. Hollywood studio bosses are said to be keen to turn Winfrey's rise to stardom as media mogul into a movie project and the Oscar winner had been linked to the lead role.

But the "Swordfish" star has laughed off the claims in an interview with TV host Ellen DeGeneres, which is due to air in the U.S. on Monday, November 15. She says, "I'm not going to play Oprah, no. I was just like (pretends to be on the phone), 'Hey, Oprah, Am I playing you? Just tell me because nobody has told me this.' I don't know where these rumors come from."

Berry admits she's not even sure a movie is being made - but she wouldn't be opposed to the part. She adds, "I don't know. Not that I wouldn't want to play Oprah if there was a movie. I just don't know how this stuff gets made up."

Winfrey will step down as host of "The Oprah Winfrey Show" later this year, to launch her network, OWN, on January 1, 2011.