There's no such thing as a bad economy when your last name is Ecclestone.

Petra Ecclestone's mother Slavica says the $18.75 million bill for Petra’s wedding to English jetsetter James Stunt at Rome's Odescalchi Castle this past August was "worth every penny, because it made my daughter happy.

PHOTOS: Petra Ecclestone Weds In lavish Ceremony

"I don't care how much the wedding cost, as it was a once-in-a-lifetime occasion ... who cares about money?" said Slavica, the ex-wife of Formula One head Bernie Ecclestone, whose net worth Forbes last year estimated as $4 billion.

British heiress, Tamara Ecclestone's mother tells her she has "mental problems" because of her spending, RadarOnline.com can report.

The 27-year-old socialite – the daughter of Formula 1 billionaire Bernie Ecclestone and Croatian model Slavica Ecclestone -  admits she loves her huge wardrobe and accessories collection, though her mom gets annoyed when she sees her excesses.

PHOTOS: Tamara Ecclestone’s Super Sexy Tyler Shields Shoot

She said: "I am aware of the recession. My mom is always having a go at me about my spending – when she sees all the clothes in my dressing room she tells me I have mental problems. But I can't pretend this isn't my life.

"OK, I feel bad about it sometimes, but it doesn't make me a horrible person. I'm not going to lie and say I don't love clothes and bags.

Watch out Paris Hilton, there's a new super-wealthy "it girl" coming to town, and this one is even richer and more fabulous!

Petra Ecclestone is planning a move stateside after buying Candy Spelling's palatial Holmby Hills mansion, and the 22-year-old blonde beauty is sure to take the states by storm.

PHOTOS: Meet The Ecclestones - Petra And Her Family