Talk about the big O!

Mel Gibson's ex-girlfriend/baby mama Oksana Grigorieva will reportedly sit down with Oprah Winfrey, according to a source for Us mag.

Winfrey, who was battling 60 Minutes for the highly coveted interview, will chat with the Russian singer about her tumultuous relationship with Gibson, and though a rep for Harpo told X17online there was "nothing to announce at this time," this would certainly be a way to go out with a bang! As you know, this is Oprah's 25th season hosting daytime television.