The 38-year-old actor congratulated Kruger, 40, in a sweet Instagram post.
"Yes she Cannes. Having witnessed the integrity and dedication that you bring to every job, I'm over the moon to see you getting the recognition you deserve. Only question is what took 'em so long! CONGRATULATIONS, Josh #dianekruger," he wrote.
Kruger bagged the award for her performance in the German drama "In the Fade", a film about the aftermath of a terrorist bombing.
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