Christina Aguilera shares loving video message for fiance Matthew Rutler

Christina Aguilera shared a rare glimpse of her love life with fiancé Matthew Rutler in a sweet Instagram video on Monday.

While celebrating her significant other's birthday, the "Beautiful" singer shared an adorable montage of the two enjoying life together and set it to the "Schitt's Creek" song "Simply the Best."

To top off her post, which contained snippets of family vacations and other fun surprises, Aguilera further honored her love in a lengthy, heartfelt caption.

"You’re simply the best, @m_rutler! Happy Birthday," she gushed. "You continuously impress me with how devoted, driven and hardworking you are, while being a devoted, loving and thoughtful parent & partner."

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She went on, "You always strive to be better and never settle for anything but. From being an amazing father to an incredible business man and forward thinker, you innovate and execute ideas on the daily."

Added the 40-year-old pop star, "From helping keep the family glue together to building the successes you do. I’m proud of you and will always be in your corner...cheering you on to keep shining and succeeding in all your wildest dreams."

Aguilera and Rutler share 6-year-old Summer. The singer is also mom to Max, 13, with ex-husband Jordan Bratman.

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Growing up in an abusive household as a child, Christina Aguilera said it was her life experiences that inspired her to step up to the plate whenever injustice was happening.