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1st Night Photos: Cressida Bonas, Adrian Lester and Jennifer Saunders celebrate Colby Sisters opening

Trip Cullman’s production opened at the Kilburn venue last night

The Colby Sisters of Pittsburgh, Pennsylvania opened at the Tricycle Theatre last night. The new black comedy by OBIE award-winning Canadian playwright Adam Bock stars Ronke Adekoluejo, Isabella Calthorpe, Claire Forlani, Charlotte Parry, Patricia Potter and Alice Sanders.

Guests in attendance at the first night party included Prince Harry's on/off girlfriend Cressida Bonas – there to cheer on her half-sister Isabella Calthorpe along with Calthorpe's husband Sam Branson – comedienne Jennifer Saunders and Adrian Lester.

Check out Dan Wooller's full gallery below.