St. Andrew Elementary School Principal Nancy Matteo called the use of DeGeneres' photo "completely wrong" because she "lives her life outside the teachings of the Catholic Church."
Matteo sent an email home to parents apologizing for the invitation and calling DeGeneres a "poor role model." She also asked parents to send back the invite so that it could be destroyed.
"A role model, as defined by Webster's Dictionary, is a person who is unusually effective or inspiring in some social role, job, position, etc.," according to the email, which was obtained by Philly.com. "This does not describe her at all. We work so hard to be good role models and then I go and do something stupid!"
The principal said that she would issue new invitations after the ones featuring DeGeneres were returned.
"I need every single invitation returned and I will personally destroy them," Matteo wrote. "Once again, I am sorry for my lack of forethought. I look forward to receiving the old invitations and distributing new ones."