This is funny. I tried to google it, and can't figure out. I am saying I guess so because I don't see what the difference is between acting and pledging under God.

No. The actors would need to sign a legitimate legal marriage certificate/contract and the actor acting as the priest/rabbi/celebrant would have to be a real licensed celebrant.

NO NO NO NO . actors are not married if they get marrieed on tv. who shhots a marriage on tv and on a movie or a serial. its just an acting that they are getting married on tv . otherwise the marry someone else on tv and someone else in real life.