Lily Allen and Azealia Banks have been sparring on Twitter.

The incident was sparked on the social networking website when Banks questioned the need for women to get plastic surgery, with a fan then sending her a previous Allen tweet in which she joked that people were jealous of her "beauty".

Banks then replied to the fan: "Weak... she can't talk though. Not when I met her coked up at yoyo... And NOT with that ugly husband she has."

The US rapper later said that Allen's husband Sam Cooper "looks like a thumb" and that her children are "ugly".

Allen, who now goes by her married name of Cooper, responded on Twitter: "Not even gonna @ her but if she wants to talk about weak, I'm sure her record sales to date should suffice. One hit wonder. And my husband ? Don't go there bitch Or your totally unnecessary security detail may actually have something to worry about #wannabe."

She concluded: "Ps we all need thumbs."