The former WWE performer and reality TV star, who was previously engaged to John Cena, shared the news with her fans on January 3.
'Excited for 2020 and the next decade with you @theartemc.' she wrote.
'I said yes in France in November! We have been trying to keep it a secret but really wanted to share our excitement for the New Year!'
She continued: 'You are the best thing that has ever happened to me. So excited for what's to come I love you more then anything and thank you for saying Yes.'
The announcement post featured a charming shot of the couple sharing a kiss while dancing together along with another photo of Nikki showing off her new sparkler.
During their visit to Europe, many speculated that the couple was on their way to being engaged.
The trip was peppered with romantic moments, but fans were convinced a proposal was inevitable when Artem introduced his love to his parents.
Nikki opened up about her Meet The Parents moment on her podcast, telling fans: 'They are the sweetest people in the world... Overall, Artem's parents did say they liked me a lot, which is amazing.'
The pair first met while partners on Dancing With The Stars back in 2017, but their connection went on to be much more serious.
While their initial chemistry was more than clear, the retired wrestler said she never expected things to get serious.
'I never would have thought even when Artem and I were dancing... we had incredible chemistry, but I never once thought that he would one day be my boyfriend,' she told People earlier this year.
'We had such an amazing friendship and when we went on our first date, it was still kind of in that friend zone.'