She has penned a track called '3' which suggests she likes being intimate with two lovers at the same time.

On the track, Britney sings: 'Three is a charm / Two is not the same / I don't see the harm / So are you game?'

The chorus continues: 'One, two, three / Not only you and me / Got one eighty degrees / And I'm caught in between.

'Countin' one, two, three / Peter, Paul and Mary / Getting' down with 3P / Everybody loves ***.'

The racy song is due to appear on Britney's upcoming LP 'The Singles Collection'.

This is not the first time Britney's career has taken a provocative twist.

The 27-year-old star – who as a teenager said she wouldn't have sex before marriage - is currently on the road with her steamiest world tour to date.

'The Circus Starring Britney Spears' - which received rave reviews - features skimpy costumes, seductive dance moves, whips, latex and blindfolds.