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17 October 2012, 10:07
The 'Young' star says the pair have their own identities when they go out in public.
Tulisa Contostavlos has said she pretends she is Niall Horan's sister when she goes out with the One Direction singer.
The X Factor judge has become good friends with the 'Live While We're Young' star and the pair were spotted together at V Festival in August.
Tulisa said that despite being well-known by the festival crowd, they wore disguises and put on a northern accent to avoid being noticed.
"We had such a good time. We were dressed in our hoodies and sunglasses, walking around the crowd," she said.
"And because we're both blonde and the same height we pretended to be brother and sister.
"The second people walk past and say, 'Is that...?' we'd start being really loud, shouting at each other in northern accents like, 'What have you done with me ciggies?' or 'Pass us that bloody pint, if our mother was here now she'd blooming kill us! Aahh, come on Chez!'"
Tulisa continued: "Tom and Chez are our nicknames when we get together and people look at us like, 'Oh no, that can't be them...' because we're talking in these really loud northern accents.
"Now I've given it away! We'll have to change it. Now we'll pretend to be from Liverpool."
Tulisa also spoke to We Love Pop about Harry Styles' relationship with Caroline Flack, saying there was nothing wrong with the pair's relationship.