Leona Lewis is reportedly set to split from her boyfriend.

The 'Bleeding Love' star has struggled to maintain her relationship with long-term love Lou Al-Chamaa while she lives in Los Angeles and he remains in London.

Friends believe Leona - who shot to fame after winning UK TV talent contest 'The X Factor' - may have already ended the romance.

A source told Britain's Star magazine: "They are still in love, but Leona's lifestyle is making things really hard.

"Her career is doing so well, but to keep growing as a singer, she has to work even harder. Unfortunately, this leaves her very little time to work on her relationship. It could already be over."

The couple - who met at school aged 10 - have not been pictured together since January.

The source added: "It is sad, but unless Leona and Lou can find a magic solution, it looks like it could be the end of the road for them."

Leona, 24, had previously been travelling between the US and UK but recently began renting a $1.5 million mansion in Los Angeles and has been spending increasing amounts of time there.