By Debbie Emery - Breaking Celebrity News Reporter

Anything you can do, I can do better!

The stinking rich daughters of Formula 1 billionaire Bernie Ecclestone are going head-to-head in an epic battle of the bricks, as Tamara, 28, prepares to move Stateside with the aim of outshining her 23-year-old little sister, Petra, Breaking Celebrity News is exclusively reporting.

The socialite-turned-reality TV star has been checking out a number of palatial estates in La La land with a view to either leasing or buying -- with several reports claiming she is particularly interested in the spectacular $125 million Fleur de Lys Estate in Holmby Hills, which was crowned the "world's most expensive house" by Forbes in 2008.

Owned by Suzanne Saperstein, the 45,000-square-foot home was modeled after Louis XIV's palace at Versailles and boasts a total of 12 bedrooms, 15 bathrooms, a 50-seat screening room and library, and a nine-car garage.

The humungous mega-mansion manages to significantly trump Petra's stunning Holmby Hills home which cost just a paltry $85 million -- and a source says that was the very intention!

"Tamara and Petra have always had a very strong sibling rivalry," the source says. "When they were little Tamara really wanted nothing to do with Petra, who was five years younger, whereas Petra idolized her big sister and followed her around like a puppy dog. They have grown a lot closer in recent years but they still re