Mandy Moore
Cast members Milo Ventimiglia (R) and Mandy Moore (L)Reuters

Milo Ventimiglia and Mandy Moore play a married couple in NBC's family drama This is Us, and they have been receiving a lot of praise for their on-screen chemistry. Although he is full of praises for his co-star, Ventimiglia doesn't think it's a good idea to date Moore, whom he described as "amazing."

"Mandy is one of the kindest, most amazing performers and women I've met in my life," he gushed to E! News. "She is exactly as I'd heard. She is amazing." As for dating her, here's what he has to say: "Bad idea—don't shit where you eat." Ventimiglia has previously dated his Gilmore Girls co-star Alexis Bledel and his Heroes co-star Hayden Panettiere, and it looks like he's talking from experience.

In other news, Ventimiglia recently opened up about playing Jack in This is Us, and revealed to Entertainment Weekly that it was his idea to grown a mustache for the role.

"I knew I was going to have to dance between decades, even greater than just the '70s and the '80s. And personally, I didn't want to act in a full fake beard because they never really feel right. So I had a chat with our makeup artist and she said, 'What if we hung on to your mustache? I said, 'That's a great idea.' One, that's period correct.

"Two, it leaves my upper lip out of the equation when I'm putting all the fake stuff on my face. So there was the practical side of it. But then there was an automatic visual representation for the audience to say, 'Oh, Jack looks different. He doesn't have his beard. This is a different time. It's 1988. Great.' You don't have to see eight-year-olds to know now you're in a different decade. You're in a different time of this man's life."

This is Us airs Tuesdays on NBC.