Petra Ecclestone may be a billionaire, but that doesn't mean she needs to run out of the house totally done up.

The Formula 1 heiress ran errands around Los Angeles Thursday afternoon, stopping at a hair salon before shopping at the Sephora store in the Century City Westfield Mall. She finished off her day of spending by grabbing an Iced Blended drink to go from the Coffee Bean & Tea Leaf in Beverly Hills.

Even though Petra went sans makeup, she still showed signs of her very well-to-do life, toting around her pricey neon yellow Birkin bag all day.

Not too shabby!

If your little sister buys the most expensive home in America and then has an insanely extravagant wedding - complete with a Black Eyed Peas performance - you'd probably want to steal the spotlight back too. And that's just what Tamara Ecclestone is doing!

The eldest daugther of Formula 1 billionaire Bernie Ecclestone and Croatian model Slavica is now starring in her own reality show - and shopping for a home as over-the-top as Petra Eccelstone's recently acquired (and paid for in cash!) $85 million Spelling mansion.

Tamara Ecclestone: Billion Dollar Girl will premiere November 4 in the U.K., and she's been in talks with major Hollywood studios to promote it in the U.S.

She should have no problem with that! Not only does she have Hollywood practically salivating over her no-holds-barred lifestyle, she's spending over $1.5 million on Amazonian rock crystal to build a luxurious bathtub in her London home.

Tamara confirmed that the price tag is no rumor, telling the U.K.'s Daily Mail:

"No, it’s completely true. They’ve gone to find this crystal which will be turned into my bathtub. It’s costing £1 million because I’ve got to reinforce the floor and I’ve had to pay for everyone’s travel and the hauling back and polishing of the crystal. But I spend a lot of time in the bath so it’s worth it."

Ironically, this is a girl who claims she was brought up grounded, saying her father raised Tamara and Petra to "appreciate money and not to take it for granted."

We would appreciate being able to buy a $1 million bathtub too. This is so a reality show we're watching if it comes to America - Tamara has Hollywood written all over her already!

Dressed to the nines in a body hugging Herve Leger dress and sky high Christian Louboutin heels, Billion heiress Tamara Ecclestone arrived at club Voyeur in Hollywood to meet up with new pal Brody Jenner Thursday night.

The Formula 1 heiress and her younger sister, Petra Ecclestone, have been making a splash in LA ever since newlywed Petra purchased Candy Spelling's mansion for $85 million, last June. It appears the sisters have been taking over the Hollywood scene ever since.

Do we hear a reality show coming soon?

Billionaire heiress Petra Ecclestone and new husband James Stunt grabbed dinner at Madeo alongside sister Tamara and her beau Omar Khyami.

Both sisters flaunted their sexy and tanned bodies. Petra also couldn't help but flash her enormous wedding ring. Talk about blingtastic!

Makes you wonder who footed the dinner bill? We have a feeling mega-rich Bernie Ecclestone doesn't mind shelling out the dough. Thanks daddy!

What Petra and Tamara Ecclestone want ... they get! The sexy socialites, who are huge fans of $10K Birkin bags, are the daughters of billionaire Formula 1 head honcho Bernie Ecclestone.

The Croatian sisters, who certainly know how to make heads turn, enjoyed a double date over the weekend at Katsuya in Hollywood. Check out just ONE of Petra's pricey rides ... a $200K Lamborghini! She also just received a brand new white Rolls-Royce Phantom as a wedding gift.

So HOW rich are they? Petra, 22, recently tied the knot to businessman James Stunt in a lavish, $5 million wedding in Rome. Her Vera Wang wedding dress was $130,000. The wedding entertainment happened to be the one and only Black Eyed Peas who performed for a reported $2 million.

The newlyweds came home to their Los Angeles mansion once owned by Aaron and Candy Spelling. Petra paid $85 million cash for her new digs!

Her stunning 27-year-old sister Tamara, a model and underwear designer, has been dating beau Omar Khyami for one year. Could another mega-million dollar wedding be in the near future? Papa Ecclestone better save up ... NOT.

The sky's the limit for the Ecclestone girls!

Apparently $85 million can buy you a home, but maybe not tact.

Petra Ecclestone is reportedly stripping the incredibly expensive home she bought from Candy Spelling, according to the U.K.'s Daily Mail.

The British Formula 1 heiress is said to be taking out all of the old-fashioned chandeliers, fireplaces, gold fixtures and wallpaper and replacing them with more modern designs.

Ecclestone also brought antique dealers into the Holmby Hills mansion to bid on any items they liked. That's one way to get rid of things - and get some of your investment back! After all, the 22-year-old supposedly borrowed $82.4 million (as in, nearly the entire bid) from her mother Slavica in order to buy the home.

See more pictures of the Spelling estate - considering the most expensive home in the United States - below.

Her name may not be as recognizable as the Hilton sisters or Ivanka Trump, but that's all about to change for heiress Petra Ecclestone.

The daughter of Formula One tycoon Bernie Ecclestone, Petra has lived an under-the-radar but extremely well-off life ... until now. The wealthy, blonde 22-year-old Brit just purchased Candy Spelling's Los Angeles mansion for a reported $85 million ... in cash.

And she already owns a $90 million home in London.

Not too shabby! But why does an engaged twentysomething need two multi-million dollar homes? The one-time model and aspiring handbag designer told Good Morning America:

"Firstly, it was a great investment and I got a really good deal, and it's kind of prime real estate. I'm planning to move to L.A. I wanted to have an amazing home where hopefully in the future I'll be raising a family. My family from London will be coming to visit so I'll need loads of space. But it really was a great investment."

Before you start counting the ways you hate her, Petra does donate to charity and claims to work regular 9-5 hours despite being born wealthy. In fact, while she admits that she does have a lavish lifestyle, Petra says she's still grounded. The heiress stated:

"I'm not spoiled, I'm privileged, and I think there's a huge difference in that."

Just keep repeating: she donates to charity.

So what did Petra get for $85 million? Find out ... after the jump.