EXCLUSIVE: Pregnant 'Huntsman' Star Emily Blunt Says Her Daughter Is 'Perplexed' at the Idea of a Sibling

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Emily Blunt is expecting her second child with husband John Krasinski, but her two-year-old daughter, Hazel, is having a tough time getting used to the idea.

"She's, like, perplexed, you know?" Blunt told ET during a recent sitdown. "How on earth are you supposed to understand that there's a baby in there? It makes no sense to her, I'm sure."

WATCH: Inside the Painstaking Process of Making the Stunning 'Huntsman: Winter's War' Costumes

Blunt went on to joke that she's also bewildered by the miracle of childbirth, prompting a little ribbing from her The Huntsman: Winter's War co-star Charlize Theron.

"Well, that's problematic. You should probably figure that out!" Theron quipped.

Blunt announced her pregnancy in January.

WATCH: Charlize Theron's Son's Reaction to Her 'Huntsman: Winter's War' Costume Is Priceless

No matter how Hazel feels about the idea of a sibling now, her relationship with her future brother or sister will undoubtedly be better than the sibling rivalry between Theron and Blunt in Winter's War.

In the action-adventure movie, Theron reprises her role as evil Queen Ravenna, who betrays her good sister Freya (Blunt) by freezing her heart to love.

In addition to Theron and Blunt, the blockbuster cast is led by Chris Hemsworth and Jessica Chastain.

WATCH: Chris Hemsworth and Charlize Theron Clash in 'The Huntsman: Winter's War'

The Huntsman: Winter's War hits theaters April 22.