Bradley Cooper thinks there's a ''double standard'' in Hollywood.

The 40-year-old actor appeared alongside Jennifer Lawrence in the hit movie 'American Hustle' and has reaffirmed his co-star's claim that women do not receive equal treatment in the film business.

He said: ''There's a double standard in the whole world, yeah, for sure. This is just one aspect.''

Bradley also backed the Oscar-winning actress and his 'American Sniper' co-star Sienna Miller for speaking out on the issue.

He told ET Canada: ''Anytime there's a place where a voice can come out and be outspoken - something Sienna did, or Jennifer - that's great. ... I think it is making a difference.''

Bradley's remarks come shortly after Jennifer admitted to being surprised by the pay gap between herself and her 'American Hustle' co-stars.

She explained: ''When the Sony hack happened and I found out how much less I was being paid than the lucky people with d**ks, I didn't get mad at Sony. I got mad at myself. I failed as a negotiator because I gave up early.

''I didn't want to keep fighting over millions of dollars that, frankly, due to two franchises, I don't need. (I told you it wasn't relatable, don't hate me).''