Emily Blunt Reluctantly Addresses Michael Buble Cheating Rumors: 'It's Complicated'

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Well, this is awkward.

In a sit-down with Howard Stern on SiriusXM on Wednesday, Emily Blunt reluctantly fielded questions about ex-boyfriend Michael Buble. The former couple split in 2008 after three years together amid rumors of infidelity on Buble's part.

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"I don't know, it's complicated," Blunt said when asked about the cheating rumors, exclaiming: "I'm going red!"

The Sicario actress did have kind words for her former flame, telling Stern that the pair "had a good time" and that she still loves his family.

"I never want to talk about it," she said of the relationship before eventually declaring: "I can't do it."

Buble has been open about his relationship missteps in the past, telling Canadian entertainment show, eTalk, earlier this year, "I was a jerk and I was careless and reckless with the hearts of women I was with."

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But for Blunt, Stern had even more uncomfortable questions in store for their interview -- though she was surprisingly forthcoming when asked about whether an actor had ever become aroused while filming a love scene with her.

"Once," she confessed. "I think it's just better to laugh about it."

Though she wouldn't name names, Blunt did say that her co-star wasn't famous.

"I think the reaction was, we were filming and they shouted, 'Cut,' and I went, 'Oop!' and he went, 'Oop! Sorry.' And that was it ... We laughed about it, because I don't want him to be embarrassed. I think that would be unfair if I was like, 'Oh my God!'"

Asked whether she would go home and tell her significant other about the on-set encounter, Blunt's response was swift: "Oh God, no."

Today, Blunt is married to fellow actor John Krasinski and together they share a 1-year-old daughter named Hazel.

WATCH: Emily Blunt Talks 'The Sad State of Affairs' of the Movie Business

On-screen, Blunt plays an FBI agent opposite Benicio del Toro and Josh Brolin in the Mexican border drama, Sicario. In her interview on Wednesday, the 32-year-old also revealed that the film's original script called for her to get naked.

"We didn't agree to do it," she said, bluntly referring to we as "my t**s!"

"We're not doing it!" she declared with a laugh, noting that, "Benicio backed me up. It was a scene between he and I that was rewritten."

In an interview with ET earlier this month, Blunt opened up about the rumors that her role had almost been changed for a man.

"It was never going to be rewritten," she clarified, before explaining, "But a financier approached Taylor Sheridan, the writer, and said, 'If you make her a dude, we will up your budget.'" She smiled flatly, "The sad state of affairs of this business."

See the interview in the video below.