Artem shared this pic on Nikki's birthday.
"I want to wish the happiest birthday to my beautiful and definitely better other half," he captioned the post. "you are my rock, you have been absolutely incredible as a mom to Matteo and I am so lucky to have you. I want to wish you lots of success, love and happiness and everything you wish for yourself. I love you and miss you and can't wait to see you to celebrate."