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The child actress, who played Jude Law's daughter in the Christmas movie, is in fact now 21, and this is news that makes us feel VERY old.
Need a reminder of the 2006 film? Here's the trailer:
Miffy was just six when she played the role of young Sophie alongside screen sister Olivia (played by Emma Pritchard), and revealed the exciting news that she was now a mum on her Instagram earlier this year.
In an emotional post, Miffy spoke out about the birth and revealed how she was fighting a "pretty nasty infection" at the time of her daughter Frankie's arrival.
Miffy told Fabulous: "She arrived at St Richard's Hospital in Chichester three days early after 21 hours of labour. Then my temperature soared, doctors realised I had an infection and I was rushed for a c-section.
"I was pumped full of antibiotics and kept in hospital for two days."
But now the mum and daughter are doing well, and Frankie is a "smiley" and "confident" baby, says Miffy.
Reminiscing on her role in the Hollywood film, Miffy explained: "It was amazing being in it. Every time it is on telly - and it is a lot - I crack up."
Miffy, who decided to quit acting in her early teens, also revealed how Jude would give her acting tips on set.
"Jude had so much time for us. He was always giving me tips about acting."
And everyone else, she admitted, was just as nice.
"I didn't know who Cameron and Jude were because I was six. But I did know who Jack was because my dad was really into alternative music and I liked [his band] Tenacious D. The first time I met him I bounded up to him and said, 'I love your music'. He was like 'that is ridiculous, you are six years old.'"
The Holiday also starred Kate Winslet and Cameron Diaz as Iris and Amanda, two women who arrange a home exchange after events in their personal lives go awry.
While American Amanda stays in a cute English cottage and meets single Dad Graham (played by Law), Brit Iris escapes for sunny LA and ends up meeting and falling for Jack Black's character, film composer Miles.
The Holiday is now streaming on Netflix if you're in need of a catch up.
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