Imogen, 31, was pictured arriving at the event, thrown by Perfect Eyelashes, with Ariana in her arms and both were grinning from ear-to-ear!
Dressed in a smart outfit, Imogen looked chic yet comfortable as she posed for pictures with her little girl.
The former Big Brother star had teamed wide-leg grey trousers with a simple white tee and a sparkly jacket for some extra festive glitz.
Ariana, meanwhile, was rocking a cosy pink coat, cool trainers and a cute tiny bow in her blonde locks. Aw!
Former Only Way Is Essex star Lauren Goodger was also at the party and she was lucky enough to get a cuddle with the tot, who was born in February.
Sharing a picture of herself and Ariana on Twitter, Lauren said: "Was lovely meet your little bubba @imogen_thomas." She also posted a love-heart symbol.
Meanwhile, Imogen is today (29 November) celebrating her birthday. No wonder she looked so happy last night!
Taking to Twitter herself, she joked with her fans: "....we improve with wine! Happy birthday to me. #31 #29thnov #sagisrule #celebrations #party #spoilt #lucky #thankful."
Too right, Imogen. Have a great day!
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