Below is an excerpt from “At Home with Britney Spears and Her Boys,” which appears in this week’s issue of PEOPLE, out this Friday. 

A hit Las Vegas show. Two happy, rambunctious boys. A hot new boyfriend who adores her. In short: life for Britney Spears has never been better.

“I’m the happiest I’ve ever been,” Spears, 33, tells PEOPLE in this week’s exclusive at-home cover story.

While her long-running Planet Hollywood residency is a big hit—the show has grossed nearly $50 million in ticket sales in a little more than a year—the superstar’s true passion is being a mother to Sean Preston, 9, and Jayden James, 8. “My kids come first in my life, bottom line,” says Spears, who shares parenting duties with her ex-husband, Kevin Federline.

As a hands-on mom, Spears has a lengthy to-do list: play dates, soccer games, gymnastics lessons and up to three hours of homework a night. “Homework is a priority,” she says. “We have a reward system that helps motivate them: if they get so many As, they get one toy a month.”

As the boys grow into “little men,” Spears is relishing their evolving personalities.

“Preston is very opinionated, very expressive, and if he doesn’t like something, he’s going to tell you,” she says. “But he has a huge heart, he’s a good kid and he has manners … Jayden is sweet, very soft-spoken, kinda funny. He’s adorable—a momma’s boy.”

For more of PEOPLE’s exclusive interview with Spears, including more personal family photos, pick up the latest issue of the magazine, on newsstands Friday.