The 'Piece of Me' singer has been spending nearly every day with former Israeli soldier Lee – who has been working full-time for her for six months – and he has even started sleeping at her Los Angeles home.

A source said: "Britney and Lee hit it off immediately. He is her perfect type. She loves guys who work out and he is in great shape from his days serving in the Israeli Army.

"He also has a few tattoos, which she loves. They’ve spent so much time together that one thing led to another and their relationship became physical."

The pair have been on holiday in Mexico together and Lee has been seen dancing around a hotel swimming poll with the singer.

The source added to Britain's The Sun newspaper: "They've been having a great time – Lee’s put a smile on her face."

Britney, 26 – who suffered a public breakdown earlier this year – recently reached an amicable custody arrangement with her ex-husband Kevin Federline, which gave her more access to her children, Sean Preston, two, and 22-month-old Jayden James.

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Photo: WireImage.com