They have been long-standing friends, bandmates and partners, but it seems the flame between Tulisa Contostavlos and beau Fazer Rawson has finally burned out.

According to a source close to the Daily Mirror, the pair have called it quits on their 18-month relationship following a series of bust ups.

It is not believed that anyone else is involved in the break up, however, the N-Dubz stars have been spending an increasing amount of time apart, despite their recent break in the Maldives.

A friend told the news provider: “Fazer has been out clubbing twice this week without Tulisa, and she, too, has been spending more time with her friends away from him.

“They are insisting nobody else is involved and clearly don’t want to stick the knife to each other because they’ve been close since they were 11.”

Pictured by the Daily Mail, Tulisa stepped out in London at the weekend looking dashing in a leather jacket, print blouse, chic pair of shorts and diamond earrings.

Although she looked a far cry from heartbroken as she posed with friends, it can be hard to tell what the 23-year-old is thinking as she is renowned for keeping her emotions under wraps.

It was only this month that Fazer and Tulisa were spotted taking a well-deserved timeout in the Maldives following The X-Factor judge’s success with Little Mix, the show’s winning act.

The couple looked completely loved up as they strolled the sandy beach and rested on sun loungers with cocktails under the warm rays.

It seems Tulisa has also maintained her holiday tan as she looked bronzed on her recent night out.

She also took to Twitter to reply to @GarethVarey, where she discussed her sunkissed look.

Suggesting the fellow tweeter was “hating”, she added: “I’ve maintained my tan from the Maldives … he’s pouring out the st.tropez as we speak LMFAO [sic].”

23-01-12 1 Tulisa’s relationship ‘fazed out’