JWoww has branded Joan Rivers ''a f**king cow.''

The former 'Jersey Shore' star - who is nine months pregnant with her first child with fiancé Roger Mathews and is expected to give birth this week - thinks the 'Fashion Police' co-host is ''a bully'' and ''rude'' for making a career out of criticising celebrities.

The 28-year-old beauty launched a shocking attack on the 81-year-old comedienne, as she discussed Joan's decision to walk out of an interview with CNN last weekend, on her friend Nicole 'Snooki' Polizzi's weekly podcast series, 'Naturally Nicole,' saying: ''She can't take the heat. Oh, but she can dish it.''

The reality TV star, real name Jenni Farley, dismissed Joan's recent claims that she never feels the need to apologise to people for her controversial jokes because she's just telling ''the truth.''

She said: ''It's not truth, it's her opinion. Your opinion is not fact, you f**king cow. I can't believe she's not dead.''

She added: ''She's rude, that's all she is, and she hides behind her rudeness by saying that they're jokes. They're not jokes.''

When Snooki mused that Joan, who has made fun of them in the past, used to be ''really funny back in the day'' and questioned, ''where she lost it?'' JWoww responded: ''When she started becoming a D-list celebrity, she had to ripen up her career a little bit. Her new TV show got cancelled with her daughter [Melissa Rivers], who should not be in show business because she's pathetic. There are just some people that just aren't meant to be on TV and she's forcing it down Melissa's throat, and Melissa entertains me as much as my beige walls.''

Meanwhile, JWoww can't wait to give birth in ''a few days.''

Asked how she's finding her third trimester, she said: ''It's the worst thing ever. It's terrible.''

She added: ''The whole thing is disgusting.''