Sharon Osbourne has slammed Kneecap for making "aggressive political statements" during their Coachella performance.

The Irish hip-hop trio, made up of Mo Chara, Móglaí Bap and DJ Próvaí, took to the stage at the annual California festival on Friday.

Following their performance, X Factor judge Sharon criticised the group for ending their set with a strong message supporting Palestine.

"Israel is committing genocide against the Palestinian people," read a message projected on stage at the end of the set. "It is being enabled by the U.S. government who arm and fund Israel despite their war crimes. F**k Israel; free Palestine."

Taking to Instagram on Monday, Sharon, who is of Ashkenazi Jewish heritage, reposted a photo of one of the messages, claiming that Kneecap "openly support terrorist organizations".

"Kneecap, an Irish rap group, took their performance to a different level by incorporating aggressive political statements," the 72-year-old wrote. "Their actions included projections of anti-Israel messages and hate speech, and this band openly support terrorist organizations."

"This behavior raises concerns about the appropriateness of their participation in such a festival and further shows they are booked to play in the USA," she continued, before urging her followers to advocate "for the revocation of Kneecap's work visa".

Elsewhere in her post, Sharon took aim at the festival's organisers for allowing the band to perform after their messages were reportedly banned during their first Coachella set a week earlier.

"Reports indicate that Goldenvoice was unaware of Kneecap's political intentions when they were booked," the TV personality penned. "However, after witnessing their performance during the first weekend, allowing them to perform again the following weekend suggests support of their rhetoric and a lack of due diligence."

Sharon also called out Independent Artists Groups, which represents Kneecap and has several employees of Jewish heritage.

"It is disheartening that they have not used their positions to prevent the promotion of such controversial messages," she shared. "Shame on them."