Round 1, B. Spears VS P. Hil!

The feud brewing between Britney Spears & Paris Hilton (allegedly sparked after Paris passed right by B at her b-day), just got a little nastier.

“Britney and her pals wrote to Paris and told her they are hearing rumors of a new sex-tape scandal, similar to the ‘One Night In Paris’ footage her ex-boyfriend Rick Salomon put on the Web four years ago,” an insider told the Daily Star. “The letter also claims the tape shows footage of Paris locking lips with one of Britney’s female friends at a party.”

The correspondence wasn’t just FYI, as it warned Paris, “If she continues being rude to people, the footage will be leaked online.” The source added, “Britney and her pals also end their note by telling Paris they look forward to hearing back from her.”