SAM Faiers has admitted she thought she couldn't get pregnant while breastfeeding.
The former Towie star is mum to son Paul and gave birth to her daughter Rosie last November.
However, in the first episode of the new series of The Mummy Diaries, Sam revealed Rosie was a surprise.
Sam said she thought nursing her son Paul a contraceptive.
Speaking to the camera alongisde her partner Paul Knightley, she said: "I didn't think you could get pregnant while you're breastfeeding."
She also told !: "Yeah, she [Rosie] was actually [a surprise]. I honestly didn't think you could, it is [breastfeeding] a natural form of contraception – they say.
"But at that point of feeding Baby Paul, it was really for comfort, I don't think I had a lot of milk – it was more just for comfort.
"So yeah, obviously I fell pregnant and I was completely surprised."
A preview clip from next week's show saw Sam weeping uncontrollably after giving birth to her daughter Rosie in a birthing pool.
"Paul, it's your little sister," she weeps following her water birth, before her boyfriend Paul rubs her shoulders.
Sam, 27, was also caught in the crossfire when her mum Suanne and mother-in-law Gaynor came to blows at a baby shower.
The argument arose over a game that predicts the gender of the unborn baby.
Sam was seen cradling baby Paul when her mother Samantha proposed that they perform a fun ritual with a pendulum.
Sam's mother-in-law Gaynor shot down the idea, replying: "Yeah, but you're talking out to something that ain't there."
Samantha was then seen looking awkward as she fiddled with the pendulum.
Her sister Billie, 28, then explained to the cameras: "Mum was going to do the pendulum thing where you guess the sex of the baby if it swings.
"She did it when I was pregnant with Arthur. It's like her little thing. Gaynor wasn't really for it."
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As the family continued to endure the awkward afternoon tea, Gaynor declared: "It don't fit nice with me."
Billie then confessed to camera: "Literally, I didn't know where to look. She was like 'no, we are not doing it."
Having the final word, Gaynor declared: "I don't believe in all that stuff. I believe in Jesus."
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