Her Royal Hotness: The Crown picks unknown actress Matilda Broadbridge, 19, to play Pippa Middleton on Netflix

Wearing a patterned dress to her sister’s wedding catapulted Pippa Middleton into international attention.

Now, more than 12 years later, an unknown actress is set on her way to stardom after being cast as ‘Her Royal Hotness’ in The Crown.

Matilda Broadbridge, 19, beat thousands of other young hopefuls to play the younger sister of the Princess of Wales in the next series of the hit Netflix drama.

She revealed her excitement to her Instagram followers last week, posting a photo of herself outside her trailer on set.

Alongside it, she wrote: ‘A very short but very sweet trip to crown land. Excited to announce that I will be appearing as Pippa Middleton in The Crown Netflix. So grateful to have been a small part of this production and experience, keep your eyes open.’

Unknown actress Matilda Broadbridge has been cast to play Pippa Middleton in The Crown in the next series of the Netflix drama.

Ms Broadbridge took part after submitting a self-made audition tape. She is expected to appear in scenes where Kate tells her family about meeting the future King

Pippa with her sister Kate at the book launch of The Young Stalin by Simon Sebag Montefiore

Wearing a patterned dress (pictured) to her sister’s wedding catapulted Pippa Middleton into international attention

Pippa wore a stunning low-cut white dress to her sister’s wedding in 2011

She revealed her excitement to her Instagram followers last week, posting a photo of herself outside her trailer on set.

Alongside it, she wrote: ‘A very short but very sweet trip to crown land. Excited to announce that I will be appearing as Pippa Middleton in The Crown Netflix. So grateful to have been a small part of this production and experience, keep your eyes open.’

Ms Broadbridge – who was educated at the £16,000-a-year Royal High School in her hometown of Bath – joins Meg Bellamy, who will play Kate, and Ed McVey as Prince William.

Kate Middleton and Prince William kiss on the balcony after their wedding in 2011

Introducing Her Royal Highness: The Crown has cast actress Meg Bellamy (left) as Kate Middleton (right in 2008) for the drama’s sixth series

Her prince awaits: Meg, who was head girl at St Crispin’s School, where she studied drama, will star alongside Ed McVey (left), who is cast as her on-screen husband Prince William (pictured right in 2008)

With no screen credits to her name, Ms Broadbridge was cast after submitting a self-made audition tape. She is expected to appear in scenes where Kate tells her family about meeting the future King. She won’t be able to wear that gorgeous bridesmaid dress, though, as the drama only covers the Welshmen’s upcoming first year together at St Andrews University in Scotland.

Speaking about her dream of becoming an actress, Ms Broadbridge said she has been dancing, singing and acting since the age of three. But she added: “It wasn’t until I was around 13 or 14 that I realized how much I loved acting and that it was something I wanted to pursue.”

She attended the National Youth Theater before signing with an agency which lists her preferred accent as ‘grown-up Albanian’.

The first four episodes of The Crown’s sixth and final season will air from November 16. Ms Broadbridge will appear in the final six episodes, which follow on December 14.