The Got To Dance judge, 32, looked radiant when she arrived at The SSE Arena, Wembley, to host the Guides and GirlGuiding Big Gig 2014 on Saturday (4 October).
Former Pussycat Doll Kimberly showed off her growing baby bump in a black semi-transparent top which she teamed with wet look leggings, a long cardigan, black heels and a chunky gold necklace.
Taking to Twitter while at the event, Kimberly kindly shared her wardrobe with her followers, saying: "Sassy and chic in all black! #BumpFashion #newlook jacket, #henryholland bodysuit/leotard, #custommade pant, #Dorothyperkins heels - @BMcosmetics."
She may have looked every inch the cool mum-to-be, but Kimberly was hiding something in her handbag - knitting needles and a blanket!
In an adorable confession on Twitter, Kimberly said: "I'm so rockstar, I'm knitting my future daughter's baby blanket between shows at #WembleyArena #rockstarmum #baby #pregnancy #nesting #BIGGIG2014."
As well as posting a picture of her not-so-secret knitting habit, Kimberly also shared a photo of herself in front of the huge crowd of audience made up of girl guides.
Alongside the snap, she wrote: "World's biggest selfie?!?!?! @Girlguiding #BIGGIG2014."
Little Mix, Neon Jungle, Stooshe, Kingsland Road, Diversity, Mike Dignam and Union J all performed at the event.
Since announcing she was expecting a baby in August, Kimberly has been keeping her followers updated with her pregnancy.
This week, she told her fans that she'd "just bought my future little girl an adorable little outfit" and also revealed she's been taking her "big old bump" to pregnancy pilates.
Kimberly married long-term partner Max Rogers in February, and announced the news by simply tweeting: "Just married.. And it was mint."
Are you a fan of Kimberly Wyatt? Tell us your opinion in the comment box below and you could win £50!
See the other celebrity couples who have announced pregnancies in 2014:
Copyright: WENN Lexie Appleby/Future Image/Bridow/InstagramReveal is now on Google Plus! Join us here for the latest pictures, fashion and celebrity news!