Kevin Winter/Getty

Haaaaaaaangin' out.

“[We] really became best friends right off the bat.

Then I would come over to his folks' house and hang out a lot with your sisters.”

Wilmer Valderrama (L) and Topher Grace pose at the premiere party for MTV’s “Yo Momma” at Privilage on March 20, 2006 in West Hollywood, California

Friends for life: Wilmer Valderrama and Topher Grace at the premiere party for MTV’s ‘Yo Momma’ in West Hollywood, Calif.Credit:Kevin Winter/Getty

“I lived with my family,” Valderrama explained.

“You don’t know what you don’t know,” he added.

“Sometimes I’d sleep over at Wilmer’s house because we were teenagers…. “He slept in my bunk bed,” Grace reported.

Topher Grace, Ashton Kutcher, Danny Masterson, Mila Kunis, Wiler Valderrama, and Laura Prepon on THAT ‘70S SHOW

The kids from ‘That ’70s Show’ (clockwise from bottom left): Ashton Kutcher, Danny Masterson, Mila Kunis, Laura Prepon, and Topher Grace.Robert Sebree/20th Century Fox Film Corp./Courtesy Everett

“I still had my childhood bunk bed.”

“I went over to Connecticut.

That’s what he said,” Grace remembered.

That ’90s Show. (L to R) Reyn Doi as Ozzie, Sam Morelos as Nikki, Callie Haverda as Leia, Mace Coronel as Jay, Andrea Anders as Sherri, Max Donovan as Nate, Ashley Aufderheide as Gwen, Debra Jo Rupp as Kitty, Don Stark as Bob, Kurtwood Smith as Red

“We went for a walk with my dad through the woods…

He kept saying, ‘This is a set.’

And my dad was like, ‘What is this kid talking about?

Wilmer Valderrama and Mila Kunis in ‘That ’70s Show’

These are the woods.'”

For more from Topher’s appearance onDos Amigos, here’s the full one-hour episode: