The former Big Brother star - who is expecting her second child - kept it sophisticated and elegant in a pretty black textured maxi dress by designer Ronny Kobo. The good news is you can pick it up at Spotted On Celeb now. The less good news is it will set you back £305...
Imogen gushed about the outfit on Instagram, telling fans: "I'm in love with this dress I wore last night! My fave designer @tornbyronnykobo I got it from @spottedonceleb I'm wearing a medium here."
She joined a slew of celebrities at last night's event including Danielle Lloyd, Nikki Grahame, Kate Lawler, Mario Falcone and Jasmin Walia.
The Pink Ribbon Foundation is a grant-making trust that funds projects and provides financial support to UK charities working with people who have been diagnosed by or affected by breast cancer.