In a long video post on her blog, Rosie O'Donnell claims fellow out lesbian Ellen DeGeneres is not allowed to talk about anything "gay, gay gay!" on her daytime talk show. Mum's the L word?

In her video, Rosie claims Ellen signed a contract that forbids her to mention anything to do with gay issues, adding, "I talk about 'gay' because I like to and she doesn't talk about it because she doesn't want to or she can't."

TMZ contacted a rep for Telepictures, producers of "The Ellen DeGeneres Show," who jokingly said "She's gay? Who knew?" The rep then added that this is completely untrue, and that they have no such contracts with any of their hosts, saying,"Ellen is free to talk about whatever she wants and we encourage her to do so."

On an episode this week, Ellen joked about being able to stand upright following her recent back injury, saying, "I'm not quite straight. Well, you know that."

In 1997, Ellen publicly came out of the closet in a groundbreaking episode of her ABC series, paving the way for hit gay-themed TV shows like "Will & Grace" and "Queer Eye for the Straight Guy."

TMZ is a joint venture between AOL and Telepictures, which produces "The Ellen DeGeneres Show."