Sebastian Stan gives his fake Pam & Tommy testicles to Jimmy Kimmel: 'Wear them with pride, baby!'

It takes big cojones to pull off a late-night stunt like this one.

Sebastian Stan, who stars as Tommy Lee opposite Lily James' Pamela Anderson in the new Hulu miniseries Pam & Tommy, brought the prop balls he used to stuff in his underwear while playing the rocker to Jimmy Kimmel Live! — and then gave them to the host.

"Wear them with pride, baby!" Stan exclaimed after he slammed his nuts down on Kimmel's desk.

James looked stunned when he presented them, and admitted she didn't know he wore them on set.

"I know it sounds insane to you, but trust me, I was like, 'I need to kind of feel like a man,'" Stan said.

"Wow, what a beautiful gift," Kimmel replied. "I've never seen anything like these before."

Pam & Tommy, which premiered on Wednesday, follows the lives of Anderson and Lee as their honeymoon sex tape is stolen and leaked to the press. Seth Rogen, Nick Offerman, and Taylor Schilling also star.

Stan revealed it was his acting coach, Larry Moss, who helped hatch the plan for him to use the prop balls.

"He told Helen Hunt, 'You need to put nickels in your shoes so you actually know, when you're acting, what it's like to stand up on your feet for 12 hours.' And I said, 'Larry, I need something myself,'" Stan recalled. "So, we came up with this idea."

Balls of steel. Literally.

Pam & Tommy is airing now on Hulu. Watch the Jimmy Kimmel Live! clip above.

Sign up for Entertainment Weekly's free daily newsletter to get breaking TV news, exclusive first looks, recaps, reviews, interviews with your favorite stars, and more.

Related content:

• How that talking penis came to life in Pam & Tommy episode 2
• Pam & Tommy stars explain how Hulu's series fixes 'misconceptions' about Pamela Anderson
• Lily James says she reached out to Pamela Anderson about Pam & Tommy but didn't get a response