Double Quincenera

I have a double quincenera and am having trouble wording the invitations. One of the girls is having a church service and the other is not. They are best friends and are having their reception party together. The girl with the church service will have her own invitation as will the girl that is not having a service.
How do I word each inviation? I want the people attending to know that the reception/party is for both girls. HELP.... I forgot to mention that the invitation is going to be a DVD music video that the videographer filmed for them to the song "girls just wanna have fun". Both will send out the same dvd but with different wording.