Tulisa parties with Niall Horan and Caroline Flack at V Festival - and rows with Lord Alan Sugar on Twitter
The businessman made his online comments during the first show of the series on Saturday night and an online row erupted between the pair.
‘Can you tell me who the hell this Tulisa bird is on X factor,' Lord Sugar, 65, Tweeted.
‘she's in the celeb section of the sun and mirror every day. What has she done?'
‘This Tulisa talks nonsense on X factor,what qualifications does she have to judge singing talent.Please advise where I am missing the point'
Tulisa, 24, soon responded to Lord Sugar's comments, Tweeting in reply, ‘@Lord_Sugar stick to judging on the Apprentice & I'll stick to what I know MUSIC #itsaNOfromme'
Even though the message was later deleted, Tulisa made sure that her feelings about the Apprentice mogul remained clear.
‘Soz bout that tweet peeps. But that twat has been bad mouthing me since last year!' she added.
‘With @NiallOfficial @carolineflack1 and @GarethVarey in disguise in the crowd!' Tulisa Tweeted alongside the pic.
‘Me n Nial pretending 2b chez n Tom from Sheffield ha #VFest'