X Factor judge Rita Ora was the victim of a burglary less than a week before a robbery at boss Simon Cowell's mansion, according to reports.

Thieves broke into a property in north-west London owned by the singer and stole cash, jewellery and electronics while a relative slept upstairs, The Sun said.

The burglary took place six days before an alleged thief crept into Cowell's £35 million home in Holland Park, west London, around three miles from Ora's house in Brent.

Police are investigating the break-in at Ora's home but no arrests have been made.

The 25-year-old musician reportedly divides her time between the £1.3 million semi-detached property and a town house in west London, although her whereabouts at the time of the burglary are unknown.

A Metropolitan Police spokesman said: "Police in Brent were called to an address in NW10 at 5.54am on Saturday November 28 following reports of a burglary.

"An investigation is under way. No arrests have been made."

Officers were called to Cowell's home in the early hours of December 4 to reports of a robbery while he slept upstairs with partner Lauren Silverman, 38, and their 21-month-old son Eric.

A 37-year-old man was arrested later that day and questioned. He was released on bail until a date in early January pending further inquiries, police said.

Cowell and Ora will appear on the X Factor's live final tonight.