The two dancing stars have been dating since last year, with Kai sharing a heartfelt tribute on Instagram as Nadiya marked her 34th birthday today (August 24).
"Happy birthday baby girl," he began. "Another full trip around the sun with you, making my world shine 365 days a year, I’m the luckiest man in the world to have you in my life and I can’t wait to share all the adventures that lie ahead together. I love you always."
Earlier this year, Nadiya and Kai opened up about their relationship, revealing that they haven't decided to move in together yet.
"At the beginning we were still figuring it out for ourselves," she told MailOnline. "It is easier now in the sense that everyone knows we're together, but having a relationship in the public eye is tough."
Kai also noted that "everything is scrutinised", and as such had initially kept their romance a secret, Nadiya adding: "But there are some positives, we get to do what we love, and create the show, so it's how you balance it."
Kai also said they were "living the absolute dream fairytale", further admitting: "We are trying to take it all in really."
The star previously said he was "instantly attracted" to Nadiya, recalling to OK!: "We got on really well then the moment for me was when we first danced together – that’s when we realised that there was something special there."
Strictly Come Dancing airs on BBC One, while spin-off Strictly: It Takes Two airs on BBC Two. Both shows are available to stream on BBC iPlayer.
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