Christina Aguilera Makes Rare Appearance with Fiance Matthew Rutler to Celebrate His Birthday! (Photos)

Christina Aguilera is helping her longtime love Matthew Rutler celebrate his 36th birthday!

The 40-year-old “Genie in a Bottle” singer made a rare appearance with Matthew while stepping out for dinner together on Monday night (April 5) at The Nice Guy in West Hollywood, Calif.

Christina took to Instagram earlier in the day to share a glimpse into their life together at home and to share a sweet message for Matt. For those that don’t know, he is an investor and Executive Vice President of the online lessons company MasterClass.

“You’re simply the best, @m_rutler! Happy Birthday ❤️ You continuously impress me with how devoted, driven and hardworking you are, while being a devoted, loving and thoughtful parent & partner. 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,” Christina wrote in the post.

She continued, “I remember when Masterclass was just a little idea being tossed around our backyard. Now knowing and seeing first-hand the backstory in how you helped grow it to become the mega success it is, I’m not surprised because I witness the magic behind the machine every day — in every sense of what you do. 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. Love you baby. ????????????.”

Check out the letter that Christina wrote on Instagram after turning 40 last year.