Britney Spears and Paris Hilton on Saturday night

As I wrote about on Monday, Britney Spears celebrated her birthday Saturday night at the "Scandinavian Mansion of Style" in L.A. Paris Hilton also happened to be there and was overheard by some dishing out some advice to her former friend. A source overheard Paris telling Britney:

''Britney, you have to listen to people who truly are experts in entertainment. You can't be listening to friends, no matter how good or loyal they are, to tell you how to run your career.''

Hilton also told Spears to pay more attention to the endorsement deals she currently has, ''or else those will go away and you'll find it harder to replace them with new deals and products.'' (Source)

What do you mean it'll be hard to get new endorsement deals? You know how lucrative the County Fair circuit can be? A gal can literally pull down hundreds per appearance. Not to mention all the free pie and lemonade. Once Britney goes down that cherry-filled path, there'd be no getting her back.