How do I make my girl feel prettier?

I just wanted to know what I can do to make my girl feel prettier. I personally think she's the prettiest girl ever but she's insecure sometimes because of her weight. I'm a fat guy as well so I feel like I can relate to her. I just want her to feel better about herself. She's my everything and I want her to know that. What are some things you guys do to make your girls feel prettier?