January 16, 2013 09:00 AM

Jon Kopaloff/Filmmagic

Motherhood makes Connie Britton the happiest she’s ever been.

“I have the most incredible kid [2-year-old son Yoby] and we’re having a great time,” the Nashville star, 45, told PEOPLE on Sunday at the Golden Globe Awards in Beverly Hills.

But the same thing that brings her joy also brings out a side of herself Britton didn’t know existed.

“I didn’t really fully comprehend the level of guilt involved [with being a mom],” the former Friday Night Lights star explains.

“I like to pride myself on not being a person who really functions at a level of guilt, and yet, man, I never knew I could feel so guilty when I work 16 hours and I really don’t get to spend enough time with my son. It’s awful.”

But in the end, despite the “challenging” balance between career and personal life, Britton says she “wouldn’t have it any other way.”

In fact, she’s open to expanding her family.

“I would love more kids,” Britton shares. “Sure, why not? Bring it on.”

— Dahvi Shira

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