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"If I could go back and talk to my 15-year-old self I'd be like, 'Seriously, listen to your mom,'" she told People. "Drink more water, put more sunscreen on, moisturize. There are a lot of people like me who wish they did more."

The country singer swears that simplicity is the key to letting natural beauty shine through. "I don't have time for complicated. I don't have space in my luggage for twenty things that do different things for my skin -- I don't know anyone who does."

Underwood is proof that a little positivity can go a long way. "My mom is a great example to me and my sisters, she's just the best," said the stage star. "If I ever had one of those days when it's like, 'I don’t feel so great about myself,' she'd always tell me, 'You're beautiful, you're funny, you sing well.' She was always a positive person in my life, which is important. People need more positive influences."