Kathy Griffin has sparked a new feud with Rosie O'Donnell, after slamming her for not inviting her to appear on Jimmy Kimmel Live!.

Rosie is guest hosting the late night show this week in Jimmy's absence, and has been interviewing a slew of celebrities in the role.

However, in a video on YouTube, Kathy took aim at Rosie for not including her among her showbiz guests.

She said: "My feelings are really hurt that I was not invited to go on Rosie's week of the Jimmy Kimmel show. And I love Jimmy so much. He's one of my oldest friends.

"I love Rosie. She's one of my oldest friends. Like I said, we're good pals. We're like sisters, and everybody knows sisters fight. Sisters and brothers fight. Best friends fight. Relatives, co-workers fight.

"And we're not even fighting. I'm just being honest."

Kathy added that Rosie told her about doing Kimmel for a week, and "one of the first things I said was, 'Well, this doesn't need to be said, but I would love to be a guest'."

She continued, referring to her and Rosie's respective feuds with U.S. president Donald Trump: "Think about it. You've got these two women who share this very unique thing in common. And while what happened to me was much more extreme than what happened to Rosie, it's pretty unusual that you've got these two women that have been so outspoken.

"He wasn't the president when she talked about him on The View, but he was the president when I talked about him. And as I have spoken about before, most of Hollywood turned on me overnight.

"The phone stopped ringing. I got fired from every job that I had coming up. I ended up going on for seven years without work, which was really bad for my brain."

Kathy concluded by saying that she'd been assured the decision not to include her in Rosie's guest stint wasn't made by bosses at Jimmy Kimmel Live!, as she added: "I will watch every night and cheer her on. Of course. If I have one call to action, it's that you guys watch the show and support her.

"Support comedy. Support women in comedy. Support bold people in comedy because we don't get rewarded very much. We usually get fired.

"I am just here to tell you my feelings were hurt. That's it. That's as deep as it gets. I'm always honest with you guys, good, bad or indifferent, and this felt like one of the times I just had to kind of put it out there and see how you feel."

Roșie responded to Kathy by leaving a comment on the YouTube, writing: "Kathy- shoulda called me honey - I didn't choose the guests …"