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They are two of Hollywood's highest paid actors, travelling the world in private jets and attending the most exclusive parties, premieres and awards ceremonies.
But behind the glamour of their tailored Armani suits, Leonardo Di Caprio and Nicholas Cage are geeks. Dino-geeks.
The actors found themselves at loggerheads recently, bidding on a 67 million-year-old dinosaur skull, reports the Daily Telegraph.
Cage eventually won the bidding war, paying US$276,000 ($358.477) for the tyrannosaurus bataar skull.
But Cage and Di Caprio are not alone in their penchant for fossils.
Dino-mania is the latest fad to sweep the world, with dinosaur bones becoming the must-have accessories for the rich and famous.
Di Caprio may have missed out on the tyrannosaurus bataar but he may still get a dinosaur of his own when a mosasaurus skeleton - an ancient marine reptile - is auctioned later this year.
Other reported dino-maniacs include Oscar-winning director Ron Howard and former Microsoft chief Nathan Myhrvold.
Internet auction sites reflect the growing trend, with everything from dinosaur teeth to skeletons on offer.
New Zealand's own Trade Me site has dinosaur eggs and dinosaur poo up for auction.
With a buy now price of $12, the seller claims the Coprolite (aka dinosaur poo) is 145 million years old.
While museums remain the biggest purchasers of dinosaur remains - the Chicago Museum paid US$8.3 million for a T-Rex skeleton - private collectors are becoming more common.
According to a recent Wall Street Journal report, the price of a triceratops skull in good condition has increased from US$25,000 to US$250,000 over the past ten years.
