Jennifer Aniston and Justin Theroux to marry

Jennifer Aniston and Justin Theroux are planning a trip down the aisle, In Touch Weekly reports.

"Jen was a bridezilla when she married Brad," a friend recalls. "But now, she's focused only on sealing the deal."

Jen has asked BFF Courteney Cox to serve as the couple's witness. "A few other close friends will be invited," the source adds. "But that's about it."

Jen's friend jokes that she might walk down the aisle in jeans and flip-flops -- but is she really joking? "That's how she's most comfortable," the friend reveals.

The friend reveals that Jen and Justin have "ironed out a prenup to protect her considerable assets."