The former Miss Wales, 31, took the 15-month-old cutie for an extra special day out on Saturday (31 May) - a celebrity gala of popular children's TV show In The Night Garden.
But, for Ariana, the celebrities wouldn't have been the star attraction. It would have been the life-size characters of Iggle Piggle and Upsy Daisy!
Imogen looked like a model mum in every way as she doted on her adorable child, while still managing to look gorgeous.
Arriving at the event at London's O2 Arena, the Celebrity Big Brother star nailed the bohemian look in a floaty floor-length skirt worn with a simple black vest.
Wearing her long brunette hair in loose curls, Imogen popped her aviator Ray-Bans on the top of her head to pose for pictures.
Before heading out, Imogen tweeted: "Loving this skirt...#boho style on our way to #inthenightgarden."
The reality TV star also expressed her excitement at taking Ariana to the child-friendly event, saying: "Can't wait to take Ariana to @NightGardenHQ! Her face will be a picture #NightGardenLive."
Ariana is Imogen's first child with her Australian boyfriend Adam Horsley.
Since giving birth in February 2013, Imogen has regained her fab post-baby body and is back to a size 10 again.
Looking fabulous Imogen!
Do you like Imogen Thomas' boho look? Tell us what you think in the comment box below!