Billie Faiers has said her pregnancy was such a shock that she even kept it from sister Sam to begin with.
The Only Way Is Essex star revealed this week that she was pregnant with her first child, with boyfriend Greg Shepherd, but said that at first she couldn't even bring herself to tell her co-star and sibling.
Billie told OK!: "We kept it to ourselves because I was so in shock. In my head I knew I was pregnant because I missed my period, which never happens, but I was too nervous to do the pregnancy test because suddenly my whole life was about to change."
She added: "We didn't tell anyone for two weeks. I invited Sam and my mum round for dinner to tell them, but Sam was half asleep on the sofa so it wasn't the right time.
"When I eventually told them they were over the moon. It was such a relief, because I could finally get excited."
But Billie said she'd be unlikely to get married before the birth: "I don't think I'd want to be a pregnant bride and I'd love our child to be there. I'd also want Sam to be my maid of honour and godmother."
Sam also shared her excitement: " I can't wait. When we were young we used to spend a lot of time thinking about this moment.
"I cried when Billie told me! It'll be the first baby in our immediate family and my mum is over the moon. She's always said she can't wait to be a nan. The whole family are thrilled."
She said she was already planning what support she could offer: "I'll be the one he or she comes to when they want fun, or if they have problems I'll be on hand to help. I posted a picture of me with my best friend Gerry's baby recently too.
"I was her birthing partner so saw the baby being born."