Absolutely! You might say something like this:
"My love, every time I look at you, I’m reminded that beauty isn't just about appearance; it's about the light you bring into my life. Your smile, your laughter, and the way you care for others makes the world a better place. You are truly the most beautiful woman in the world to me, inside and out. I’m so grateful to have you by my side. You inspire me every day and fill my heart with so much love. Thank you for being you."
Feel free to adjust it to make it more personal or include specific traits that you adore about her!