bruh
Explanation:
wait what is this Arabic?
You are cute in Japanese is Anata wa kawaidesu <span />
Ummmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
Just say whats in your mind since this is your sister's wedding just stay calm and just talked about the good things that you two did when you were children. Express how you feel and tell your sister that you are proud and happy for her. :)
Hope this helped