The 27-year-old portrays Daisy Buchanan in Baz Luhrmann's adaptation of F Scott Fitzgerald's classic novel and her character's wardrobe featured millions of pounds worth of precious gems, reported Contactmusic.
"I would be doing a scene, wearing these fabulous jewels from Tiffany's worth many, many millions. There'd be diamond bracelets on each arm, and diamond earrings, and rings, and strings of pearls around my neck. And I could see this guy in the corner watching me intently, in case I ran off with anything," she said.
"I had to feel as healthy as I could, because I had to look good in those dresses. I went to the gym, and ate well. We were a healthy pack of actors. Leo and Tobey kept themselves fit. In character, we were all drinking Moet; but off the set we behaved ourselves and were strait-laced in Sydney.