No Billboard Music Award Appearance for Britney Spears  11/30/06

Britney Spears has sensationally pulled out of co-hosting the Billboard Music Awards in Las Vegas on Monday (04DEC06), just hours after show bosses boasted she'd appear onstage with new best pal Paris Hilton.

The pair was billed to host the star-studded show together, but Spears has now withdrawn.

A source says, "We really don't know the reason. But we're disappointed she backed out."

But Vegas fans hoping to catch a glimpse of the pop princess, who once wed in Sin City, won't have to wait too long for a Spears sighting - she will host a New Year's Eve party on 31 December (06) at Pure nightclub, where her estranged husband Kevin Federline shot his video for debut single Lose Control earlier this year (06).