The 23 year-old Brit was visibly shocked when the 'Late Show' host asked, "Who sexes the animals?"
Emma Watson is currently on promotional duties for her new movie, the historical epic 'Noah.' As the film, directed by Darren Aronofsky, premieres in New York today (Wednesday 26th), Watson made an appearance on the 'Late Show' the day before.
Watch over-eager fans meet Emma Watson outside 'Lettermen' studios here
The former 'Harry Potter' star showed that she is turning into one of Hollywood's most beautiful young women as she arrived in a sophisticated yet chic look, with a white and black ensemble.
However, the most striking feature of the 23 year-old was her bright red lipstick, which served as the perfect contrast to her outfit.
When being interviewed on Tuesday night, the talk-show's host David Lettermen left the young Brit speechless after asking a range of rather blunt questions.
Letterman asked, "Who sexes the animals?"
Watson was visibly stunned by his query as she shook her head and let out a nervous laugh.
"You know what I mean?" Letterman continued probing.
"Um, I don't quite understand what you're saying," Watson sceptically replied.
"My son is very fond of turtles," Letterman explained. "And he will come to me with a turtle and ask me, 'Dad, is this a boy or a girl?' And I know how to sex a turtle."
This was met by a huge roar of laughter from the audience in the studio.
Watson stars as Noah's daughter-in-law alongside, Jennifer Connolly, Ray Winstone and Russell Crowe (Noah), plus many more. The movie's budget of $130 million was used to mainly showcase the visual spectacles and monumental cinematic moments which attempts to translate the enormity of this biblical tale.
Watch Emma Watson's Appearance on David Lettermen below
Russell depicts the man who was picked out by God to save all the world's creatures by building an ark to protect them when a flood is sent to purge the world of evil people.
However, Aronfsky's 'Noah' isn't a quiet, peaceful man, but a warrior who is tasked with ensuring the survival of good in the world. Other than that, the director seems to capture the true tale of 'Noah's Ark' from the Old Testament, and isn't ruined by Hollywood clichés.
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