CANNES TS -

Kristen Stewart and Robert Pattinson have called time on their troubled romance yet again.

The Hollywood couple has reportedly decided to end their relationship after a rocky year that saw them break up and get back together again several times after she was caught cheating on him with married movie director Rupert Sanders.

Despite being snapped together looking cosy at Coachella Festival and out celebrating Kristen's birthday in recent weeks things have now turned sour between them according to People Magazine.

On Monday Kristen spent time apart from Rob as he celebrated his 27th birthday with a group of male friends instead of with her. And the pair was expected to stay a £5000-a-night suite in a posh hotel at the Cannes Film Festival - but neither of them has been spotted in France. A source has since told People that they have been "having problems" and "fighting a lot" so are now taking a break from one another - but it may not be permanent.

Kristen and Rob's four-year relationship - which kicked off when they were cast to play vampire lovers Bella Swan and Edward Cullen in the Twilight movie series - hit the rocks when she was spotted getting cosy with Snow White And The Huntsman director Rupert in August last year. Following the shock revelation they briefly split before getting back together a few weeks later in September. However by January it was all over again as Rob jetted off to Australia while Kristen stayed in Los Angeles.

Then in March the on/off couple decided to give things another try and were thought to be well on the road to turning around their troubled past.