By Alexis Tereszcuk - Breaking Celebrity News Entertainment Editor

Kourtney Kardashian is a fiercely loyal sister, especially when it comes to Kim Kardashian! The reality star and her baby daddy were dining in a Miami restaurant at the same time Kim’s ex Reggie Bush and his pregnant girlfriend were there, and she refused to sit next to him!

Kourtney, Scott Disick and their son Mason all headed out for dinner Friday night at hotspot Makoto where she asked for her favorite table and was told that her sister’s ex was already seated there!

Annoyed, Kourtney refused to take another table close to Miami Dolphins football star and Lilit Avagyan.

“I am not sitting near him,” Kourtney said with a sour look on her face, according to the New York Post.

They were quickly seated at another table in the restaurant, far away from Reggie.

Kim and her new boyfriend Kanye West ran into her ex in Miami back in October, and following that chance meet-up, Kanye blew up at a photographer who asked if they’d congratulated Reggie on his girlfriend’s pregnancy!