What should I do or say tomorrow ?? ?

My friend's bd was on friday and I didn't really get a chanse to buy her a gift and tomorrow I'm gonna meet her at school and it would be so imbarasing that I didn't buy her a gift what do you think I should do ?? Please suggest good ideas or something good to say and apologize for not buying it and am sure am gonna buy her a gift tomorrow after am back from school ..... Thank you (: