The reason they were there was to catch a glimpse of US pop band the Jonas Brothers - Joe, Nick and Kevin - who had turned out to support youngest sibling Nick as he made his West End stage debut as Marius in Les Miserables.
After the show they posed for pictures with cast members including Camilla Kerslake (Cosette) and Samantha Barks (Eponine), and producer Cameron Mackintosh.
Les Miserables is now in its 25th year, and to mark the occasion a special anniversary production is currently touring, there'll be a run at the Barbican (its original home) later this year, as well as an anniversary concert at the O2 Arena - which Nick Jonas will be involved in.
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PHOTOS BY DAN WOOLLER FOR WHATSONSTAGE.COM.