Hannah Arterton has said she and sister Gemma love both being actresses because they can share in each other's excitement.
The Atlantis actress stars in big screen musical romance Walking On Sunshine and said her sister was also her best friend.
She explained: "We're best friends really, so whenever we get a great script through it's always really exciting and we call each other and talk about it, and send each other pictures from sets, it's really great.
"It's like having your best friend and your sister doing the exact same thing as you, it's like a dream really, it's really great."
In Walking On Sunshine, Hannah plays the sister of a woman due to marry after a whirlwind romance in Italy, but when Hannah's character arrives for the wedding, she realises the groom is her ex holiday fling.
Tamara Drewe star Gemma is currently working on thriller The Keys To The Street, an adaptation of a Ruth Rendell novel.
Walking On Sunshine is in cinemas from June 27.