By Charlotte McIntyre Kai Widdrington has a close bond with girlfriend Nadiya Bychkova’s daughter, Mila. The Strictly Come Dancing professional described his co-star and girlfriend’s daughter, 7, as “one of the cleverest little girls I have ever met”. Kai, 28, and Nadiya, 34, met on Strictly at the end of 2021, falling head over heels for each other, but the couple initially kept their relationship secret. Kai and Nadiya went public with their relationship in 2022, with the latter previously revealing how the happiness of her daughter, who she shares with her ex-fiancé, Slovenian footballer Ma…