The former Big Brother star, who gave birth to daughter Ariana Siena last year, showed off her enviable curves at a glitzy showbiz bash in London.
Imogen, 31, had spent the day filming for a new secret project with BBC3, meaning she is due to be back on our TV screens soon.
But despite her day of hard work spent in front of the camera, she still looked fresh-faced.
The mum-of-one wore the nude lacy number to the Nordoff Robbins Six Nations Rugby Dinner at The Grosvenor House Hotel in Park Lane.
Imogen teamed it with a simple pair of black patent heels and carried a coordinating clutch bag. She topped off her look by wearing her hair in loose waves and opting for a smoky eye.
Earlier in the day, Imogen had teased her fans by tweeting: "Filming for BBC3 today! Magic happens!"
Go on, Imogen, spill the beans!
Are you looking forward to having Imogen back on your TV? Tell us below, as the best comment from across the website each week wins £50.