Tulisa was caught up in a furious row at Glasgow airport after her PA and best friend, Gareth Varey, was reportedly headbutted.
According to reports, the bust up occurred after Gareth overheard derogatory comments being made about the X Factor judge as they waited for their flight back to London following Tulisa's appearance at the In: Demand Live event at Glasgow's SECC on Sunday.
The Mirror reports that a row and scuffle erupted in WH Smith, which resulted in her PA allegedly being headbutted.
An onlooker told the paper: "There was a lot of talk about one of Tulisa's group being headbutted. They all wanted the matter to be sorted out before take-off. She stayed back with a girl and a guy and continued arguing their case with staff.
"She was desperately trying to defuse the situation but the argument was getting heated.
"Tulisa was saying she didn't want to see her friend get into any other arguments as a result of this one not being rectified. She didn't want to leave the matter unresolved."
Police stepped in and hauled Gareth off the plane to be quizzed with the other person involved.
Strathclyde police said on Monday: "We were called to an incident within Glasgow airport involving two people. They were both spoken to and no complaint was made."
A spokesman for Tulisa adds: "There was an argument at the airport but no further action is being taken."
It hasn't been the best of starts to Tulisa's week - the following day she was caught up in an earthquake with her boyfriend Jack O'Connell in Bulgaria.
The N-Dubz star had jetted to the country to visit her beau but the pair were left shaken after a 5.8 magnitude quake hit.
Taking to Twitter after the quake, Tulisa wrote: "WWWtttff how can I just get caught in an earthquake... Thought the whole building was coming down... thought it was The Exorcist looool. I can't bloody sleep after that... I've been in a few earthquakes but that was the strongest... twas (sic) a lot... building was swinging."
Skins actor Jack added on his Twitter page: "Just about pooed myself - heroic"
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