Los Angeles - Leonardo DiCaprio is still recovering from a back injury he sustained on The Wolf of Wall Street.
The actor - who is up for an Oscar for his role in the banking drama - hurt his back when filming a scene where he falls down a stone staircase while on Quaaludes for the movie, and is still finding it hard to move properly.
DiCaprio has had to abandon his exercise regime and it's going to take him months to fully recover.
A source told America's Star magazine: "He says he is in non-stop pain and has gained weight because he can't exercise. It hurts to lie down for too long, and it's agony to twist his body into any crazy positions.
"Leo hasn't even been partying, because dancing is painful."
DiCaprio's performance as disgraceful stockbroker Jordan Belfort has earned him a Best Actor Oscar nomination and of course if he were to walk away from the Academy Awards with the prize "it would ease the pain".
DiCaprio, 39, has previously admitted the part was a dream role for him and although he is thrilled the film received five Oscar nominations he is just happy it got made.
He previously said: "To me the fact we even got to make this film is a gift, there are two films that I've really wanted to do in my life and I've worked really hard to make and it's this and The Aviator so it's a great feeling."