In her new tell-all book, Kathy Griffin’s Celebrity Run-Ins: My A-Z Index, Griffin dishes on her take on other celebrities.

There is one celebrity she’s afraid to reveal the truth about however and that’s reportedly Ellen DeGeneres. “I’m almost positive a certain beloved daytime talk show host once had me kicked out of a backstage dressing room at the Emmy Awards,” writes Griffin in her new book. “I can’t prove it, but this person, who has short blonde hair, has a mean streak that all of Hollywood knows about.”

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The comedian spoke exclusively to Us Weekly about her feud with DeGeneres – during her 2007 appearance on “The Ellen DeGeneres Show”, the talk-show host did a monologue about how mean Griffin is. “I was in the dressing room like, ‘S**t! You’re another woman comic, c’mon!’” Griffin reveals.

In March of 2007, DeGeneres bashed Griffin in an interview with W magazine. “I know she had a big thing about wanting to be on the show, and we didn’t book her,” DeGeneres told the magazine. “She did a whole thing that I banned her from the show. I didn’t ban her from the show, because first you have to be on the show to be banned.”

Meanwhile, Griffin admits she tells jokes about other women but clarifies, “I just feel really strongly about women supporting each other, especially women over 50 and women in comedy, because the people who still make decisions are still middle-aged white guys. We have to be better at not turning on each other.”

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Even with their disagreements, Griffin has “immense respect” for DeGeneres and says she just wishes she would support other female comics more: “When you think about the guys who are in my age group, or even guys I started out with, like Kevin James and Ray Romano. They all help each other and hook each other up.”