Kelly Clarkson isn't bothered by criticism.

The 'Second Hand Heart' hitmaker has learned not to take any notice of those who try and tear her down and wants to show her children - River Rose, three, and 18-month-old son Remington Alexander - the importance of building an ''armour of confidence'' around them.

She said: ''[Criticism] does not bother me. I'm very fulfilled in my life ... I'm a mother and I care what is said to my kids and I want them to build an armour to wear, an armour of confidence.''

And the 35-year-old singer - who has River and Remington with her husband Brandon Blackstock - admits she has never felt ''sexier'' or more confident since she became a mother.

Speaking to Willie Geist in an upcoming interview for Sunday Today, she added: ''Becoming a mother and wife, I've never felt sexier, I've never felt more confident, I've never felt more empowered.

''I don't think you have to get married or have to have children to have those things to have those things, it's just that's what happened to me personally.''

It comes after Kelly admitted becoming a mother has made her worry about the ''pettiness and trivial things a lot less''.

She shared: ''It's so funny, because I talk to all my mom friends about this all the time. I've always been a confident girl, I've always felt sexy and intelligent. But after becoming a mother, the amount of s**t that you get done, you're so impressed with yourself!

''It's the most empowering feeling, because it makes you want to worry about the pettiness and trivial things a lot less. I think that trickled down to the messages and sassiness that are on this record. Art is a reflection of your life, so this record is happy and empowering, and I love that.''