All eyes were on the young British actor when the drama, in which he plays a billionaire money manager, opened at the prestigious international movie event in France.
Pattinson admits the nerve-wracking experience of watching the screening with hundreds of reporters was a world away from red carpet premieres with loyal Twilight fans.
He tells culture magazine BlackBook, ""I was kind of s**tting myself... I lost my mind. I was preparing myself to fight with 1,500 people. I was so amped up... I was just kind of running around with my pants down and my shoelaces untied and, amazingly, not falling. Until this. I thought, 'Oh f**k!' Most people get 15 years of doing movies nobody sees. Now I'm at Cannes.""