And in true Pricey style, she made sure all eyes were on her, flaunting her assets in this pretty incredible, insanely colourful get-up.
We're pretty sure NOBODY could miss her.
She's basically a human rainbow, right?! Or a real life Rainbow Brite. Or My Little Pony-themed person.
Down to the very last detail. Just check out those rainbow sparkle-covered shoes!
We'll admit, we're loving the fact her tiara is made out of boxes of hair colourant product. Quite appropriate considering she was at a photocall for ColourB4 in central London!
It marked her first public appearance since news of her husband's affair broke in May.
The model was left devastated to learn Kieran had been sleeping with her close friend Jane Pountney, a betrayal made all the worse by the fact she's currently six months pregnant with Kieran's second child.
Katie gave birth to their first child, Jett, last year.
Since the affair became public knowledge on 7 May, the pregnant star has remained relatively out of the limelight, apart from the occasional Twitter outburst at her cheating husband.
Katie has branded Kieran "disgusting" for cheating on her while she was pregnant, and has called former friend Jane a "wh*re" and "homewrecker".
Jane has not said anything publicly about the affair apart from admitting it did happen and she deeply regrets it, however Kieran has given a handful of interviews about what happened - and his desire to win Katie back.
Kieran has said he suffers from compulsive addiction and insisted he never loved Jane. Last month, he even went as far as branding their affair nothing but "dirty sleazy sex".
He's now said he wants to win Katie back - but so far, it appears she isn't interested.
At the weekend, however, the former couple did reunite for a hospital appointment to check up on their unborn child. A source told The Sun: "She is an emotional wreck. She absolutely hates what Kieran did to her and is trying to be strong about the end of their marriage.
"But at the same time, she's heavily pregnant with his baby and feels very vulnerable. Of course she wants him to be part of this process."
Got an iPad or iPhone? Reveal Mag is specially designed to fit!
More crazy Katie Price costumes below: