Kelly Clarkson has set her new husband a festive deadline - she wants to be pregnant by Christmas (13).

The Since U Been Gone singer wed Brandon Blackstock in Tennessee earlier this month (Oct13) and she has made no secret of the fact she's desperate to become a mum after getting maternal around her partner's kids from a previous marriage, Seth and Savannah.

And she insists the newlyweds aren't messing around when it comes to their family plans.

She tells Los Angeles DJ Valentine, "I want babies... Everybody keeps saying, 'What do you want for Christmas?' And I want to be pregnant.

"I never ever really wanted kids because I'm kinda selfish with my career but I really like going to soccer games with Seth and doing homework with Savannah... It's such a bigger point to life.

"I kinda want two more (kids); I've already told him (Blackstock)... I kinda grew up alone and I'm kinda a loner and so I don't want them to be alone - and Seth and Savannah are so much older."

And her new husband isn't complaining about her plans: "He's excited about all the practice."