and kick off new seasons on Monday with a special crossover, and only ET was on the set of the upcoming premiere event. star Noah Mills takes over the ET mic as he goes from actor to interviewer, chatting it up with the casts of both CBS dramas.

The action kicks off on the season 20 premiere of before concluding on the sophomore opener of .«You and Vanessa [Lachey] have known each other a long time, tell me something about her that you think might surprise her fans,» Mills asked star, Wilmer Valderrama.«Honestly, I don't know if the fans understand the amount of energy that she has and I think it's a big testament to being a supermom.

Nick [Lachey] is a badass and them together complement each other so well,» Valderrama praised.Valderrama and Lachey have been friends for two decades, so it was like an old hat when he flew over to the set of to film the two-hour crossover.When the cast members were asked a similar question about what they liked best about working with Valderrama for this episode, they all had equally glowing things to say about their cohort.«I think he's hilarious,» Yasmine Al-Bustami said, while co-star Jason Antoon joked, «I can just ask him about .»When it came time to show off the guns in a battle of who's tougher — Lachey's Jane Tennant or Valderrama's Nick Torres — it was an impressive showdown.«Let's see who's tougher,» Lachey teased, flexing her impressive biceps.«No, no, I could never,» Valderrama said, graciously acknowledging defeat as she egged him on.

Finally, he complied and showed off his muscular strength.But ask which team has the «most swag» and they'll fight tooth and nail for their respective crews.«I would argue, Mark Harmon, sexiest man alive!» Valderrama quipped.Noah Mills.

'NCIS' Star Wilmer Valderrama Says 'NCIS: Hawaii's' Vanessa Lachey Is 'Supermom' (Exclusive)

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