Pippa Middleton Attends Another Wedding in London
05/25/2012 AT 01:50 PM EDT
Middleton, 28, wore a bright orange dress to the ceremony and appeared to be attending solo, according to an onlooker.
The newlyweds were David Marsham and Katherine Phillips. The groom is the brother of a close friend of Pippa's older sister, Kate.
Following the service, Pippa and the other guests strolled through St James's Park, heading to the reception.
It was the second wedding this week at which the younger Middleton was a guest.
Last Saturday, she attended a friend's wedding in Scotland, wearing the same dress Kate donned to announce her engagement to Prince William.