Miranda Kerr's son demanded to know if she was pregnant a day after she got married.

Miranda Kerr

Miranda Kerr

The 34-year-old model - who previously spoke of the fact her spouse Evan Spiegel did not want to have sex before marriage - is expecting her second child, and her seven-year-old son Flynn is "so excited" to be a big brother because he'd been asking for a sibling for a long time.

Miranda - who has Flynn with ex-husband Orlando Bloom - said: "Evan and I had been together for a while, and [Flynn] was like, 'When are we going to have a baby brother or sister?' We were like, 'We've got to get married first.'

"The day after the wedding, he comes running in, and he's like, 'Mommy, is it in there?' I was like, 'Honey, give it a minute!'"

Though Evan is the co-founder of Snapchat, Miranda insisted her labour and delivery won't be documented on the social networking app.

Asked about the possibility, she told talk show host Jimmy Kimmel: "No. My husband's a very private man."

And though the KORA Organics founder loves to share snippets of her family life with her loved ones via the app, she won't be use it to show her fans.

She said: "What I love about Snap is you can send your friends and family these little intimate moments that you're [comfortable] sharing. So, my family in Australia - we Snap all day long.

"But publicly, it's a different thing. You want to keep some things private."

Meanwhile, Miranda admitted back in December that her most recent pregnancy has been more troublesome than was the case with Flynn.

She said: "I have been getting hormonal headaches, which I never got with Flynn.

"Apparently, my doctor said [with] the second pregnancy, your hormones kind of kick in a little stronger because they're like, 'Oh, yeah. I know what's happening. I know what to do.' So that's probably why."

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