Paris Hilton has rocked ex-boyfriend Nick Carter's new year celebrations by insisting dating him was the biggest mistake she made in 2004.

The socialite-turned-reality TV star split from the Backstree Boys star this past summer (04) after a torrid romance, and she still can't believe she fell for the "a**hole."

Hilton tells Rolling Stone magazine, "I don't know what I was thinking. I met him, and I didn't really like him. He kept calling my bodyguards. "I was like, `I'm not going out with a Backstreet Boy.' Then I ended up thinking he was, like, nice, and I ended up liking him... but he ended up being an a**hole in the end."

However there are other soacial issues too, which concern the young hotel heiress. While dealing a blow America's tattoo artists and cosmetic surgeons Paris says skin art is "unoriginal" and boob jobs are "gross."

Hilton, who coined the year's top phrase, 'That's hot,' is urging young women to think twice about going under the knife to boost their boobs - because it's no longer fashionable to have enhanced breasts.

She says, "When I was younger, like 16, I wanted them so bad. I was begging my dad, like, 'Can I get a boob job?'

"When I turned 18, I was like, 'I'm not getting them. They look deformed.' All my friends that have them, they look so gross. I'd rather not have any and not have to wear a bra."

And she's just as scathing about girls who opt to get their bodies tattooed - like her sister Nicky.

She adds, "They look cool on some people, but I don't want any. Plus, I'd get sick of them. (They're) so cheesy, so unoriginal. Every girl I know has one, even my sister."