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Emily Blunt, Michael Buble

Lester Cohen/WireImage

Anything can happen when you're on Howard Stern's radio show.

Emily Blunt started her Wednesday by appearing on the host's popular Sirius XM show. While the actress may have been stopping by to promote her new film Sicario, the conversation quickly turned to a famous ex-boyfriend.

Stern began to praise Michael Bublé as a bright and fun man—two characteristics Blunt completely agreed with. But when Stern suggested that they were "perfect together," Blunt wasn't so sure.

"I don't know if I was perfect with him," she shared on the show. "But we had a good time."

She continued, "I loved his family. I still do. I love his family."

Stern wasn't done just yet. He later brought up the rumors that Bublé wasn't faithful during their romance that lasted close to three years. Let's just say Blunt tried her best not to go there.

"I don't know. It's complicated," she said while laughing. "Now I'm going red because I never talk about it. I never want to talk about it."

She added, "You're like the great seductor. I can't do it."

Both parties have totally moved on since the high-profile romance. Bublé has been married to Argentinian model Luisana Lopilato since 2011. Meanwhile, Blunt happily said "I Do" to John Krasinski back in 2010.

Watch Ellen DeGeneres pull the ultimate prank on Emily Blunt below.