Styled for the occasion by Angie Smith, Amanda wore the white duo with metallic heels by Christian Louboutin and jewellery by H.
How lots of celebrities have been caught without a shirt and bare-chested? Should still be on the iplayer if anyone wants to watch it.
The top of her plunging white trouser suit gave way to expose a little more of her bosom than she'd intended as she climbed into a waiting cab to make her way home.
Others to watch Amanda take to the stage as leading lady Vera included Lesley Joseph, Julia Bradbury, Clare Balding and Maria Friedman.
Amanda Holden suffered an embarrassing wardrobe malfunction while exiting an after-party for the West End launch of new play Stepping Out on Tuesday evening And she appeared to be aware that that something was amiss while leaving the venue with her lookalike 11-year-old daughter Alexa, as she covered one of her breasts with her hand.
Styling her dyed hair with a simple centre parting, Amanda beamed while posing for photos shortly after arriving alongside co-stars Tracy Ann-Oberman, Anna-Jane Casey and Nicola Stephenson.