Paris Hilton has defended her 'perpetual partyer' tag, insisting that she goes to parties to earn a living."[Partying] is what I do for a living. I get paid to go to events and parties, and it's fun," the New York Daily News quoted her, as saying.The hotel heiress claims that she can keep up such late hours because she hardly ever drinks."I only have Red Bulls when I'm out, so I never wake up with a hangover or anything," she added.Hilton also revealed that she'd be having her third birthday celebration in L.A. over the weekend - and that she'd have "10 birthday parties, if I could. So long as people are paying me, I could keep going
