How to ask my friends to add me in a private group on facebook?

[Blue Ivy Carter]

So Im a teenage girl. Group of my friends made this group on fb where they privately uplode pic of our going outs and stuff. The group consist of 15 people prolly. They never added me in it and I know its not on purpose! We had this inbox with about 15 of those people where we were arranging our Friday and Saturday parties ( which I went to) and my friend said to eveyone of us to upload pic of this weekend in the group. Butidk how to say that im not in the group! Should i just ask them to add me in the group? I will feel so lame doing that, but i realy wanna see the pic cos im in the pic too! Should I send a msg in this inbox with 15 people? so im guessing someone will add me. Or just to one friend not to embarrass myself that much? Please help me what should I say?

[wasup]

Tell just one of them