On Wednesday, the mum-of-one and her partner both took to Instagram to let their followers know that the following day would be their "last chance" to purchase tickets to the couple's 2024 stage show, Behind The Magic, at presale prices.
They shared the news alongside a stunning advertisement featuring Nadia in a daring red dress with a thigh-high slit and her blonde hair styled into loose waves. In the image, she clutches her boyfriend's lapel as Kai looks dapper in a black suit and white shirt, with one arm around his girlfriend and both of them smiling for the camera.
While they initially kept their relationship under wraps, the two have since opened up about falling in love after they began to dance together on the BBC dance competition. When the pair danced together last year on the programme, viewers rushed to share their appreciation on social media.
One person wrote: "Kai and Nadiya dancing to Luke Evans singing 'Bridge Over Troubled Water' is everything," while another added: "That felt like I was watching Kai and Nadiya have the first dance at their wedding."
A third viewer tweeted: "Kai and Nadiya dancing together is just beautiful. Their love for each other is so evident," while another agreed, commenting: "Kai and Nadiya as real-life boyfriend and girlfriend dancing together is so beautiful."
Last month, Nadiya took to social media for an Instagram Q&A where she was bombarded with questions about the fact that she doesn't have a celebrity partner on Strictly. When asked by one fan: "How come you don't have a Strictly partner this year??"
Nadiya was quick to respond: "Hundreds of questions and messages about this subject [praying hands and white heart emoji]." She went on: "Thank you for all your love and support [it] means the world. I posted about it after the launch show.
"Like I said, I will miss teaching and sharing a very unique experience with someone who never danced before, but I am supporting each and everyone this season, they are the loveliest people."
The professional dancer finished by adding: "Let's enjoy the incredible lineup and amazing show," followed by a red heart emoji.
Earlier in September, the 34-year-old, who made her debut on the dance competition back in 2017, took to social media to express her feelings after seemingly being snubbed by the hit show.
Breaking her silence, Nadiya penned: "I'm sure you'll understand that I'm disappointed not to be partnered with a celebrity on @bbcstrictly this series. It is an amazing show to be a part of and I'm still so excited for all the group numbers, performing with some of our music acts and much, much more."