Mustache

One day I was at school and there was a girl that was giving her party invitation. I saw that everyone that had recived the invitation was laughing and I didn't know why. After some days a friend told me that people were laughing because she was with a mustache in the invitation's photo.
Then another friend was so curious that asked her to see the invitation and she shown him. After seeing he starts doing some jokes to me about the girl's mustache.
At the end of the class we were walking at the corridor and he starts doing those jokes again. And he said:
- Marianna, who am I? I'll give you a hint, I have a big mustache in my invitation's photo.

I start laughing and when I realized: the girl was in front of us, and I told my friend this. He was so embarassed that I laugh more.

I don't know if she heard it. I hope not!