In the world of style no-nos, turning up to a party in the same frock as someone else is the ultimate fashion faux pas.

And echoing her sister’s recent incident – where the Duchess of Cambridge wore the same Missoni coat as another guest at a society wedding – Pippa Middleton and Lisa Snowdon played twinsies at a London party last night.

The pair turned up to the annual Waitrose Summer Party wearing dresses in the exact same shade of green – along with the exact same pair of nude heels.

Pippa, who was recently at the centre of a media storm after being accused of wearing a false bottom to her sister’s 2011 wedding, wore a lacy capped sleeve dress from Tabitha Webb while Capital FM host Lisa Snowdon wore a simple but chic shift.

Kirstie Allsopp, Mary Berry, Ben Fogle and Pippa Middleton

Pippa and Lisa were joined by a host of TV stars including Mary Berry, wearing an on-trend white lace jacket, Ben Fogle, Kirstie Allsopp and Phillip Schofield.

After the party, Pippa headed out for dinner with her brother James and his girlfriend Donna Air.