Forgot my SO’s birthday 😳

I forgot to tell him happy birthday I know for a fact he hinted it was his bday.. it’s just that his birthday dinner is tomorrow and in my head I’m just set on celebrating tomorrow 😩😩 I feel so bad bc he always goes all out on my birthday. How do I make it up 😩😩😩😩 I’m not one to lie and act normal like I didn’t forget 🤷‍♀️ we both really appreciate honesty but I have a feeling he will hold it over my head. He is 27 today.