However, it appears 33-year-old Pippa broke one of the most basic wedding guest rules – never wear white!
Breaking with tradition The Duchess of Cambridge’s sister donned a stunning black, white and floral Kenzie Gown from Erdem.
The long, high-necked dress gave off a 70s vibe – a complete contrast to James’ traditional tux.
The pair were one of several guests in attendance for the ceremony of entrepreneur Jöns Bartholdson and Anna Ridderstad at Stockholm's Oscar Church. After the ceremony the group took a steamboat to a Villa Pauli to continue celebrations.