MILAS KUNIS ON ASHTON KUTCHER'S PENIS SIZE

The star stopped by "The Late Late Show," hosted by James Corden where she and Christina Applegate were put in the hot seat in a hilarious game of "Spill Your Guts or Fill Your Guts."

The rules: each player had to choose to either answer an uncomfortable question or eat an unusual food.

Mrs. Kutcher opted to answer a question first. "Ashton Kutcher: carrot stick or beer can?"

The actress was a little confused by the reference at first, but laughed as she debated whether to comment on her husband's penis. "Oh, my God. What do I do?" she asked. Corden said, "You can either tell us or you can drink the clam juice."

Kunis chose carrot stick, but quickly backtracked. "Carrot stick?" Corden asked, raising an eyebrow.

"But beer cans are short," Kunis explained.

"No, not a big beer can," Corden corrected her.

"A beer can!" Kunis shouted. "A beer can!" in defense of her original answer, she told Corden:

"I'm thinking it's short and stubby or long and thin. But no, [it's] like a Guinness."

E! News caught up with Kunis at the premiere of 'Bad Moms' where she told how Kutcher felt about her "Guinness" comments. "He was very happy about the Guinness."

Mila Kunis revealed to Howard Stern that she and Ashton Kutcher started out as casual sex buddies years prior to getting married.

Kunis, who played Kutcher’s love interest on That '70s Show for eight seasons, told Stern that she and her hubby, would have never worked out had they gotten together in their younger days: "We would never be together based on the people that we used to be."

Sparks flew between them years later, when Kunis accepted Kutcher’s invitation to attend a housewarming party in 2011. Although the Jobs star initially meant to set Kunis up with one of his friends, he ditched that plan once she arrived to his home.

The actress told Stern that Kutcher’s good looks “took her breath away” the moment she laid eyes on him that night — and her man immediately became “territorial” of her.

The duo tied the knot in July 2015. Kunis is currently pregnant and expecting her second child with Kutcher.