She has written three cookbooks and is known for creating decorative baked goods often featuring whimsical themes and cute renderings of animals.

Kim-Joy Hewlett was born c. 1991[1] in Ottignies, Belgium[2] to an English father and a Malaysian Chinese mother; she has extended family in Malaysia.

[3] Friends had encouraged Kim-Joy to apply to be a contestant on The Great British Bake Off, but until 2018 she "didn't feel confident enough".

"[10] The Takeout said her "uncanny ability to make things that are so cute that by all rights I should be over-dosing on the sweetness, yet somehow never actually crossing that line" was her "superpower".

[13] The Sunday Post said in 2020 that in the franchise's then ten-year history, "no contestant has embodied the wholesome warmth of Bake Off more" than Kim-Joy.

Kim-Joy appeared in The Great New Year Bake Off January 2022 special, competing against fellow series-nine participant Jon Jenkins and two series-eleven contestants, Hermine and Rowan Williams.

[15] Library Journal said the book "channels her positive outlook and vibrant imagination into a joyful cookbook bursting with whimsical bakes" but that "some recipes and decorating techniques are quite complicated, and impractical for the typical home baker".