Los Angeles, California - Bradley Cooper opened up recently about how fellow actor Will Arnett helped him find sobriety.

Cooper joined the SmartLess podcast, hosted by Arnett, Jason Bateman, and Sean Hayes, for their 100th episode on Monday.

At one point, the Nightmare Alley star began reflecting on an early period of his career, around age 29, when he struggled and had "zero self-esteem."

"I was so lost... and I was addicted to cocaine," Cooper explained.

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"I could not get into any clubs, no girls wanted to look at me. I was totally depressed," he added.

It wasn't until his long-time friend Will Arnett called him out that he realized he had a problem with drugs and alcohol.

"Will took that risk of having that hard conversation with me in, like, July of 2004, and that put me on a path of deciding to change my life. It truly was Will Arnett. He is the reason."

The two shared a heartfelt moment, relating on how they each found sobriety through things like therapy and fatherhood, and how great it is to watch each other succeed.

"It has been awesome seeing you in this place and seeing you comfortable, nothing has made me happier," Arnett said. "It's made me happy to see you so happy with who you are."

Bradley Cooper and Will Arnett's story shows just how important having a good friend can be.