United Kingdom, Oct. 3 -- Jessica Simpson is in awe of her children's musical talents.

The 45-year-old singer - who has Maxwell, 13, Ace, 12, and Birdie, six, with ex-husband Eric Johnson - finds it "wild" when she hears any of her kids sing because their ability is way beyond her own.

Speaking on The Jennifer Hudson Show, she said: "My youngest can belt her brains out. Like, she has got the power and I don't know Megadeth or, like, full on gospel, but she's got the lungs.

"Maxwell, my oldest, has, like, perfect pitch. My son has perfect pitch. It's kind of wild when you [hear] them humming along. I'm like, 'Wait, I can't even do that riff.' "

Jessica has learned a lot from her children.

She said: "I love being a mother. They teach m...