Rupert Grint admits that he was nervous about getting naked in front of Bill Nighy.
The Harry Potter actor stars alongside Nighy, as well as British actress Emily Blunt, in new movie Wild Target directed by Jonathan Lynn.
Speaking to Bang Showbiz he said: "It's quite embarrassing where I had to stand in the bath, I had a jock strap kind of thing... it was weird because it wasn't water, it was milk... to make the water look cloudy so you couldn't see anything - we were in a bath of milk.
"Thankfully there weren't many people on set just me and Bill. He didn't really say very much, but yes it did feel just a bit uncomfortable for the both of us.
"It's embarrassing, I've never been to a gym or really done any sports... but I'm not lazy as I'm always working or busy doing something."
This is the second movie of 2010 for Grint after starring in Cherrybomb earlier in the year. He is currently working on Harry Potter and the Deathly Hallows, which wraps in two weeks.
Deathly Hallows is the final part of the Harry Potter saga, however it will be split into two movie the first part being release in November of this year.
But the young actor is also set to star in new movie Eddie The Eagle, where he will take on the title role.
Wild Target is released 18th June
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