The Big Momma's House star welcomed her second child, a son named Kez, with her basketball player boyfriend Ime Udoka in November (11) and Long believes motherhood has given her a new lease of life.
She tells TheUrbanDaily.com, "I am the happiest that I've been probably in my life.
"Baby Kez Sunday has given me a bit of a rebirth and it's really nice because I'm able to look at life through his eyes. You have to pay attention to the smallest thing from the birds chirping to the dog barking across the street. These are the things that make the world go around today. When you look at life in its simplest form, stress and worry isn't (sic) the cornerstones of your life. Experiencing life through that lens is refreshing."
Long has been on a career break since wrapping her last project, a 2011 drama called Mooz-lum, and she admits she's in no rush to return to work - but her eldest son Massai has other ideas for his mum.
She says, "My 11-year-old is running the show. He's like 'Mum, when are you making another movie?' I'm a true believer that good work finds you and I hope that I've established enough of a career of myself that when they want Nia Long they'll find Nia Long."
Massai is Long's child from a previous relationship with actor Massai Z. Dorsey.