Stephanie Pratt thinks there is "something wrong" with her because she doesn't want to have children yet.

Stephanie Pratt

Stephanie Pratt

The 30-year-old reality TV star doesn't understand why she and her brother Spencer - who is in a relationship with Heidi Montag - haven't wanted to become parents before now.

She explained: "He and I are late bloomers - there's something wrong with us. I think it's because our parents babied us, so we never really grew up. But he's turned a corner in the past year."

The 'Made in Chelsea' star would love to become an auntie to Spencer's baby in the near future.

She added: "I'm already an auntie to three kids with my sister, but I'd love to be a little Speidi aunt."

But it looks like she may develop the urge to become a mother when she meets her co-star Binky Felstead's baby later this year because she'll be spending a lot of time around the newborn.

She said: "For the first three weeks [after she found out about Binky's pregnancy], I got chills whenever we talked about it. It's so exciting. I think Louise [Thompson] will be next, but the cast is so young."

And Stephanie can't wait to take on babysitting duties when Binky's little one enters the world.

She said: "I'll be the best auntie ever but I definitely believe in, 'When they nap, you nap.' When my sister had her first kid, I was babysitting. She came home one day and I was asleep in her bedroom. She was like: 'Stephanie, what the f**k?' I was like: 'Ava was napping!' She said: 'Ava was playing with a puzzle!' "