That's not what Princess Margaret wore! Helena Bonham Carter wears TRAINERS as ...

She has transformed into Queen Elizabeth II's sister for the critically acclaimed drama.

And Helena Bonham Carter put an interesting twist on Princess Margaret's wardrobe as she stepped out in trainers to film series four of The Crown in London on Tuesday.

The Oscar nominee, 53, was the spitting image of the Countess of Snowdon as she sported a sculpted beehive hair do, oversize shades and an amethyst headscarf.

Comfort: Helena Bonham Carter put an interesting twist on Princess Margaret's wardrobe as she stepped out in trainers to film series four of The Crown in London on Tuesday

Comfort: Helena Bonham Carter put an interesting twist on Princess Margaret's wardrobe as she stepped out in trainers to film series four of The Crown in London on Tuesday

The star wrapped up in a purple tailored coat and a patterned dress, paired with ash grey velour gloves.

Helena swapped the Royal's court heels for a pair of monochrome trainers as she strolled between takes, with a member of the crew holding an umbrella over her head.

The star was seen filming scenes in a silver 1980s Jaguar XJ12 as the crew followed her down the street.

The Crown series four has commenced filming in London, ahead of an expected release later this year. 

Royal: The Oscar nominee, 53, was the spitting image of the Countess of Snowdon as she sported a sculpted beehive hair do, oversize shades and an amethyst headscarf

Royal: The Oscar nominee, 53, was the spitting image of the Countess of Snowdon as she sported a sculpted beehive hair do, oversize shades and an amethyst headscarf

Interesting: Helena swapped the Royal's court heels for a pair of monochrome trainers as she strolled between takes

Interesting: Helena swapped the Royal's court heels for a pair of monochrome trainers as she strolled between takes

Seeing double: Helena was the spitting image of Princess Margaret as she stepped out on set

Royal: Princess Margaret is pictured in 1987 - the Royal died in 2002

Seeing double: Helena was the spitting image of Princess Margaret as she stepped out on set 

Off we go: Helena stepped out with a member of the crew holding an umbrella over her head

Off we go: Helena stepped out with a member of the crew holding an umbrella over her head

Blonde Emma Corrin, who plays Princess Diana, has been seen on the show's set several times in recent weeks with Josh O'Connor  as the pair make their debut.

On Monday, the on-screen couple were rumoured to be filming scenes recreating Prince Charles' birthday outing in 1987.   

Viewers got their first glimpse of O’Connor as the Prince of Wales when series

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