John Krasinski has joked he had to "bulk up" in the gym to keep his wife Emily Blunt happy.

John Krasinski and Emily Blunt

John Krasinski and Emily Blunt

The 36-year-old American actor tied the knot with the 32-year-old actress in July 2010 after a two-year romance and he readily admits he's a lucky guy to be married to such a beautiful Brit.

John claims the reason he accepted a role as a US Navy SEAL in new war movie '13 Hours: The Secret Soldiers of Benghazi' was to get in shape to keep Emily interested in him.

During an appearance on 'The Jonathan Ross Show', he quipped: "Yes I married Emily - I know what you're thinking, 'What?! That guy got her?' It's true, it's true. Why do you think I bulked up? I had to earn it!"

John also spoke about the couple's 23-year-old month daughter Hazel and revealed she has picked up her mother's British accent.

The former 'Office' star said: "We have an amazing daughter named Hazel and she definitely is picking up on her mom's accent which I think is adorable especially at Christmas - the whole Santa, Father Christmas thing like blew her mind ... She has a British accent for some things."

Although John has been hitting the gym very hard in recent months - losing 21 per cent of his body fat for '13 Hours: The Secret Soldiers of Benghazi' - Emily preferred him "doughy".

Speaking about his new torso, he previously said: "She hates it. She would way prefer to have doughy guy back."

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