We go behind the scenes of NCIS: Los Angeles to give you a sneak peek of the episode in which the real-life moms of several cast members actually guest-star alongside their famous kids!

The show’s creator Shane Brennan said the idea for the unique episode came to him when he met some of the parents on the set. After that, he said writers were tasked with creating “the perfect script and perfect episode” to bring all the moms together for the episode.

Appearing onscreen are the real-life moms of Chris O’Donnell, LL Cool J, Daniela Ruah and Eric Christian Olsen. “I thought it was a joke,” explains O’Donnell about first hearing the idea. “Mom was excited when I called her up and told her the news, and said, ‘I’m coming, I’ll be there.'”

Watch the videos above to hear the moms reveal when they knew their children were going to be stars.

Source: ETOnline & CBS