The 'So What' singer said that her life has greatly improved since she and husband Carey Hart had 15-month-old Willow Sage, and that because of her new responsibilities as a mother, she now greets every day with a bright and positive attitude.
The singer told The Ellen DeGeneres Show: "Oh yeah. I'm way more fun.
"I used to wake up and go, 'Oh, I should check my pulse?' I don't feel good, and what am I going to do today? I don't know if I'm happy.
"And now I'm like, 'Let's start with a cuddle. What song are we singing?' And it's just a dance party and now my husband can't call me a freak cause somebody's dancing with me."
She added of her daughter: "Willow is heavenly. She's changed the way I look at life.
"She's funny and fiery, with Carey's looks and my attitude. It's been amazing watching my man stumble awkwardly into love with his baby daughter."