The 34-year-old actress stars alongside the handsome actor in the new biographical drama 'First Man', and Claire has admitted to relishing the experience, saying Ryan is the most ''generous, kindest, funny actor''.
Speaking to 'Entertainment Tonight', she explained: ''I literally feel like God has arrived. He's amazing, like, well done, Canada.
''He really is the most generous, kindest, funny actor. It's just incredible to work with him.''
Emma Stone, another of Ryan's former co-stars, also recently heaped praise on the Canadian actor.
The Academy Award-winning actress - who has appeared alongside Ryan in hits such as 'La La Land', 'Gangster Squad' and 'Crazy, Stupid, Love' - admitted she couldn't imagine her life without the actor.
She added: ''He's so special. It makes me emotional. He's so talented but he's such a great person to work with because he's so collaborative and excited about the process.
''He's taught me a lot about being really generous.''
Emma, 29, explained that she and Ryan struck up a good partnership the moment they met, and they've remained good friends ever since.
She shared: ''We really hit it off. We've been just pals ever since.
''He is a wonderful person, but also an incredible actor. It's a lucky thing that we get to do three [movies together]. It's not bad.''
Despite this, Ryan believes director Damien Chazelle - who helmed 'La La Land' and 'First Man' - ought to be given more credit for creating such a healthy working environment.
He said: ''I think he creates a certain environment that makes everybody feel creatively involved and it feels like a true collaboration, but he has great vision.
''He's able to work at these enormous scales but still have the environment feel intimate and creative. So, I think we all are very lucky to work on his movies.''
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