Sergey Lazarev recently celebrated his 43rd birthday, and the artist couldn't help but share with his fans on social media the extraordinary way his beloved heirs – son and daughter – congratulated him. The children prepared a real musical surprise for their star dad, a touching video where, among other tender words, there was a special thank you for the 'genes'. "I dance awesomely — thank you for the genes. You taught me not to doubt, to be myself, and not to be afraid. Objectively — the best dad," sang 11-year-old Nikita and 7-year-old Anna in the clip.   But the surprises didn't end there! Lazarev also delighted his followers with another video, where his charming daughter performs the song "Happy Birthday to You" with heartfelt emotion, skillfully accompanying herself on the piano.  ## Parenting Secrets It is known that both Nikita and Anna were born through surrogate mothers. At the same time, Sergey Lazarev does not hide that the biological egg for fertilization was provided by the same woman, whose identity the singer carefully protects from publicity. "Nikita and Anya have one biological mother, but my children were carried by different surrogate mothers," the singer said in one of the interviews.    ## Life Off Stage Sergey actively participates in raising his children, dedicating as much of his free time to them as possible. During tour periods, their loving grandmother takes care of Nikita and Anna. Interestingly, both children are passionately engaged in the dance studio of Alla Dukhova "TODES", the same one from which their star father graduated in his time. Photo: lazarevsergey/Instagram