Nicole Scherzinger's split from Formula 1 ace Lewis Hamilton has left the former Pussycat Dolls singer "heartbroken" and "completely devastated," though it seems the decision to end their five year relationship was mutual. The couple are believed to have gone their separate ways after it became apparent their busy working schedules left little time for each other.

Nicole Scherzinger and Lewis HamiltonLewis Hamilton [L] and Nicole Scherzinger [R] At The Men In Black III Premiere

A source told Mail Online: "Nicole is just so heartbroken and completely devastated." The news comes just weeks after Hamilton hinted that he was planning to propose to Nicole, 34, "We've been together for five years, which is quite a milestone really. But hopefully in the near future. Maybe before we get to six years," he said.

Nicole has been regular attendee of Hamilton's various Grand Prix fixtures, though admitted she knew little about the sports itself and was only there to support her husband. "I only go to a Grand Prix to support Lewis. I am in awe of Formula One because there is so much money, technology and talent, but as for the racing, it really is like trying to understand rocket science when I'm there, trackside," she said. "For me there's only ever one winner and a lot of people would agree with me on that - Lewis is the best." 

Nicole ScherzingerNicole Scherzinger At The X-Factor Auditions In London

Hamilton started on pole for Sunday's British Grand Prix at Silverstone after setting a bewildering fast lap on qualifying, though could only manage fourth place in the race after suffering a punctured tyre. 

Since committing to the UK X Factor for another year, Nicole has been busy filming auditions in Glasgow, Dublin and London. The time the pair were pictures together was at the Canadian Grand Prix in Montreal on June 10, 2013.