Sharon Osbourne has shared her low opinion of Kanye West by slamming him as an "average talented" rapper who should be selling cars for a living.

The 60-year-old X Factor judge offered her two cents on the hip-hop star, known for his narcissistic leanings, in an expletive-laced interview the Daily Beast.

"He bores me. He's an average-looking man with an average talent - but he's a great salesman," the co-host of CBS' The Talk said.

"He should sell cars because they would f***ing fly out the door. He's his No 1 fan."

Her harsh words come as West, who has been even more boastful in recent weeks, continues to promote his new album Yeezus.

In June, he faced criticism for comparing himself to Jimi Hendrix and Jim Morrison and calling himself the "No 1 living and breathing rock star."

"Cause it's like, Yo! Nobody can tell me where I can and can't go," he told Rolling Stones magazine.

Osbourne has also reignited her feud with Danni Minogue and revealed that she left The X Factor UK six years ago over differences with the Australian singer.

"She's insignificant but at that time, I let her get under my skin and I should have been the bigger person," said Osbourne.

"But hey, I chose to leave. That's all in the past.'