Tulisa Contostavlos has hit back at Lord Sugar after the business mogul slammed her on Twitter.

The Apprentice boss posted a message on the site at the weekend, asking who Tulisa was and saying The X Factor judge talked ‘nonsense’ on the show.

Lord Sugar tweeted: “Can you tell me who the hell this Tulisa bird is on X factor, she’s in the celeb section of the sun and mirror every day. What has she done?”

The 65-year-old also wrote: “This Tulisa talks nonsense on X factor, what qualifications does she have to judge singing talent. Please advise where I am missing the point.”

The N-Dubz star hit back, tweeting: “As someone that came from nothing to something maybe u should have a little more respect for people that have done the same.

“I have grafted from the age of 11 with my band NDUBZ, we wrote & produced all our music,sold 3 platinum albums,3 sell out tours the last being an arena tour & a number 1 debut solo single!

“I have worked my b***dy ass off! So mr lord of judgement… stick to judging on the Apprentice & I’ll stick to what I know MUSIC #itsaNOfromme.”

She subsequently deleted those tweets, but posted another suggesting Lord Sugar stick to judging The Apprentice.

The 24-year-old tweeted: “Soz bout that tweet peeps. But that t*** has been bad mouthing me since last year!”