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The new X Factor judge defends Dappy in a row about an affair.
Backstage at a recent N-Dubz gig, mum to Dappy's kids Kaye, accused Tulisa's mate Ny of having an affair with Dappy, which she denied.
Tulisa wasn't impressed with Kaye's accusations as grime star Ny is one of the N-Dubz singers BFFs, so a verbal slanging match ensued.
"Tulisa and Ny are close friends and she was very upset," a source told The Sun.
"Tulisa was angry that Kaye had bounded in accusing (Ny) of doing something she hadn't done.
"And then spitting at her which is disgusting."
Dappy has had an on-off relationship with Kaye for four years but the pair got back together last March.
An N-Dubz rep confirmed the row, saying "Tulisa was upset Kaye had accused her best friend of stomething she hadn't done."