So she ended up not bringing her friend, but this A-list diva did have a run in with one of that couple her friend hates.
Right before the ceremony started, the wife asked an usher if she could talk to the diva, presumably about the friend.
The usher returned with a message:
“Ms. *insert last name of diva here* cannot or will not speak with you right now.”
The wife ran over to the diva’s seating area and flipped her the bird.
The diva responded with a double barrel salute. Stay classy you two.
A-list diva: Jennifer Lopez
Friend: Leah Remini
Wife in couple: John Travolta’s wife Kelly Preston
Source: Mr. X via http://www.crazydaysandnights.net