Newly engaged Britney Spears regularly took part in orgies and threesomes during her 'wild' tours, one of the singer's former minders has claimed.

Fernando Flores, 31, a bodyguard who worked for the Oops! I Did it Again singer for five months in 2010, said the former pop princess got wild and kinky with both men and women while on tour, according to reports.

Flores now claims to have penned a tell-all book which lays bare all the star's kinky secrets, including details of her alleged orgies and make-out sessions.

To add salt to the wound, Flores has reportedly lined up a million-dollar deal with a major publisher that will see the book's summer release coincide with Britney's third wedding to Jason Trawick, 40, who was formerly her manger.

The Sun newspaper reported that Flores confided in a friend: "Britney has a huge sexual appetite and, from what she told me, her tours were an anything-goes environment.

"I heard stories of threesomes, orgies, girls making out - things that would make your hair stand on end."

The ex-police officer, who launched a sexual harassment lawsuit against the 30-year-old mother-of-two in 2010, claiming she repeatedly stripped in front of him and tried to sleep with him, also alleges that Britney once admitted to getting "crazy" with some girls in a hot tub.

Recalling the event, Flores, of Orange County, California, said: "I was in her bathroom and saw this picture of her in a tub with some girls. It was very sexual. She told me, 'That was on tour and s**t got crazy.' I asked what she meant and she said they all got it on. Her and the girls."

Britney's spokesperson refuted Flore's allegations and pledged to fight his claims.