Imogen, who is mum to baby daughter Ariana, was pictured with pals as she left London's exclusive Nobu Berkeley Square restaurant following a meal.
The former Big Brother star, 30, teamed her sleeveless frock with a pair of nude Louboutin heels, a camel coloured jacket and a coordinating shoulder bag.
Keeping her brunette hair loose, Imogen topped off her look with a gold necklace, white watch and a beaming smile!
Despite Big Brother: Secrets and Lies launching last night, Imogen chose to head out rather than stay in and watch this contestants enter the compound.
However, she did make reference to being on the show herself seven years ago.
Imogen retweeted a TV producer who commented about the spin-off TV show she and fellow housemate Glyn Wise recorded after their series finished.
The tweet said: "When I filmed Glyn & Imogen with @GlynWise and @Imogen_Thomas I think that was the last 'Big' year for Big Brother. Good times!!"
Check out our gallery below to see this year's Big Brother contestants
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