The Ecclestone sisters, who outdo almost everybody by being extravagantly competitive when it comes to sibling rivalry, have now spread their oneupmanship to the most exclusive tier of the American property market.
Just a few months after Petra bought a mansion once named as the most expensive home in the States, Tamara is all set to move into the house ranked number two just down the road, the Daily Mail reported.
The elder daughter of F1 tycoon Bernie Ecclestone is eyeing up the lavish Fleur de Lys estate to add to her property portfolio, undeterred by its 78-million-pound asking price.
The five-acre estate in the Holmby Hills in Bel Air, Los Angeles, was modelled on Louis XIV's Palace of Versailles - and certainly contains all the opulent luxuries a modern-day princess could demand.
As well as its 12 bedrooms and 15 bathrooms, the mansion contains a 50-seat, satin-lined private cinema, a two-storey wood-panelled library stocked with first-edition books and garage parking for nine cars. Not to mention a gym, a ballroom based on Louis XIV's Hall of Mirrors at Versailles and a formal dining room.
The 45,000 sq ft house, tucked away behind gates and a 200-yard driveway, was commissioned in 1996 by Texan billionaire David Saperstein for his wife Suzanne. It was completed in 2002 but less than two years later the couple's 23-year marriage collapsed.
Mrs Saperstein was awarded the estate in the divorce, and put it on the market in 2006 for 78 million pounds. In 2010, Forbes magazine named it as the second most expensive property in America - behind late TV guru Aaron Spelling's 123-room mansion, The Manor, just down the road.
Petra bought The manor from Spelling's widow last year for a 'bargain' 53 million pounds. It is the largest in Los Angeles County and boasts a room solely designed for cutting flowers. (ANI)