Things have just gone from bad to worse for Britney Spears – with new reports emerging that the pop-tart has been caught up in yet another sex tape scandal.

Just one day after losing primary physical custody of her two children to ex-husband Kevin Federline, an unnamed 28-year-old man has confessed his sex tales with the 25-year-old to a U.S. tabloid magazine.

The mystery man - who bedded Spears while she was vacationing on Hawaii in June 2007 – claims to have caught their sweltering one night affair on tape. 

However her one-night-stand man claims that he has refrained from releasing the tape because of his slapdash performance. 

He told the In Touch Weekly: "It was just normal sex, we didn't do anything crazy. It was a little disappointing. It lasted for about 25 minutes and then we passed out."

The 28-year-old was living in Hawaii when he met Spears at a bar on 7 June 2007.

They retired to her room at the Four Seasons hotel on the KonaKohala Coast where they had sex. 

The mystery man admits Spears had no knowledge he was filming their sex session.