Holly Willoughby Shares Theory To Guess Gender Of Unborn Babies, Tries It Out On Serena Williams' Photo

'Do it, I tell you, it's always right.'

Holly Willoughby shared her theory on how to guess the gender of a woman’s unborn baby by trying it out on Serena Williams’ latest pregnancy photo.

Williams had tweeted a photo out of her bare baby bump and asked fans whether they thought she was expecting a girl or boy.

Straight away, Willoughby said she thought it was a girl, then demonstrated her “theory” on guessing the gender of babies.

“You see the shape of your hand if it goes in like that it’s a boy,” she explained on ‘This Morning’ on Wednesday 28 June, holding her hands on each side of her stomach.

“So if it goes in at the bump it’s a boy and if it goes out there then it’s a girl.”

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ITV/ThisMorning
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ITV/ThisMorning
Holly Willoughby demonstrating what a bump looks like if you're expecting a boy.
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ITV/this
Holly Willoughby demonstrating what a bump looks like if you're expecting a girl.

“As I’m looking at the picture, she looks like she’s going out there,” Willoughby continued.

“It’s hard to tell in a photo but if you’re pregnant at home do it, I tell you, it’s always right, it’s that shape.”

So what do you think? Can you tell by looking at Williams’ bump that it’s a girl? 

Williams revealed in April 2017 that she “accidentally” announced she was pregnant by sharing a photo on Snapchat.

“I have this thing where I’ve been checking my status and taking pictures every week to see how far along I’m getting,” she told a TED conference in Vancouver, Canada, according to EuroSport.

“I was just saving them (for myself). I’ve been so good about it, but this was the one time it slipped.” 

Before You Go

Pregnant Celebrities 2017
December 2017: Helen Flanagan and Scott Sinclair(01 of31)
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'Coronation Street' star Helen Flanagan has confirmed she and her partner Scott Sinclair are expecting their second child. The couple are already parents to two-year-old Matilda. (credit:Doug Peters/EMPICS Entertainment)
December 2017: Candice Swanepoel and Hermann Nicoli(02 of31)
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Candice Swanepoel and her fiancé, Hermann Nicoli announced they are expecting their second child together. They are already have 14-month-old son Anacã together. (credit:Michael Stewart via Getty Images)
September 2017: Roxy Shahidi and Arsher Ali(03 of31)
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Roxy Shahidi revealed she is expecting her first child in September, announcing she was having a baby girl. (credit:Matt Crossick - PA Images via Getty Images)
September 2017: Kim Kardashian and Kanye West(04 of31)
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The couple confirmed they were having their third child. It is rumoured that they are having their third child via surrogate. (credit:Doug Peters/EMPICS Entertainment)
September 2017: Jamelia(05 of31)
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Jamelia revealed on 29 September she was six months pregnant with her third child. (credit:Barcroft Media via Getty Images)
September 2017: Adam Levine and Behati Prinsloo(06 of31)
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The couple announced they were having their second child. They are already parents to one-year-old Dusty Rose. (credit:Axelle/Bauer-Griffin via Getty Images)
September 2017: Brendan and Zoe Cole(07 of31)
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LONDON, ENGLAND - JANUARY 06: Brendan Cole and Zoe Hobbs attend the VIP performance of 'Kooza' by Cirque Du Soleil at Royal Albert Hall on January 6, 2015 in London, England. (Photo by Anthony Harvey/Getty Images) (credit:Anthony Harvey via Getty Images)
September 2017: Aston Merrygold and Sarah Richards(08 of31)
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Aston Merrygold and Sarah Richards revealed they were expecting their first child together. They posted a series of photos on Instagram with the poem: "Could be pink, could be blue, all we know is that we are due." (credit:Dave J Hogan via Getty Images)
August: Jack Osbourne and Lisa Stelly(09 of31)
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The couple announced they are expecting their third child. They are already parents Pearl, five, and Andy, two. (credit:Barry King via Getty Images)
August 2017: Rose Byrne and Bobby Cannavale(10 of31)
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Rose Byrne announced she was expecting her second child with Bobby Cannavale. They are already parents to one-year-old Rocco. (credit:EMPICS Entertainment)
August 2017: Coleen Rooney and Wayne Rooney(11 of31)
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Coleen Rooney revealed she and Wayne Rooney are expecting their fourth child together in August 2017. (credit:PA Wire/PA Images)
August 2017: Ore Oduba and Portia Oduba(12 of31)
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Ore Oduba announced his wife was expecting their first child together. (credit:PA Wire/PA Images)
July 2017: Charlie Simpson and Anna Barnard(13 of31)
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Charlie Simpson revealed he was expecting his second child with wife Anna Barnard. (credit:Mike Lewis Photography via Getty Images)
July 2017: Jessica Alba and Cash Warren(14 of31)
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Jessica Alba announced she was expecting her third child in July 2017. She and Cash Warren are already parents to nine-year-old Honor and five-year-old Haven. (credit:Patrick McMullan via Getty Images)
July 2017: Danny Jones and Georgia Jones(15 of31)
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Danny and Georgia revealed they were expecting their first child together in July 2017. (credit:David M Benett via Getty Images)
July 2017: James Corden and Julia Carey(16 of31)
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The couple are expecting their third child, PEOPLE magazine confirmed. (credit:David M Benett via Getty Images)
July 2017: Sam Faiers and Paul Knightley(17 of31)
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Sam Faiers revealed she was expecting her second child with her partner Paul Knightley by posting an Instagram photo of herself and her son on 4 July. (credit:Barcroft Media via Getty Images)
July 2017: Nicky Hilton and James Rothschild(18 of31)
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Nicky Hilton announced she's expecting her second child with James Rothschild. The couple are already parents to one-year-old Lily Grace. (credit:Marc Piasecki via Getty Images)
July 2017: Andy Murray and Kim Sears(19 of31)
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Andy Murray and wife Kim Sears revealed they were expecting their second child together. (credit:Doug Peters/EMPICS Entertainment)
June 2017: Cara Kilbey and Daniel Harris(20 of31)
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Former TOWIE star Cara Kilbey announced she was expecting her second child with her boyfriend Daniel Harris. They already have one daughter together. (credit:Mark Cuthbert via Getty Images)
June 2017: Katie Piper and Richard Sutton(21 of31)
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Katie Piper revealed she was expecting her second child with Richard Sutton on Father's Day 2017. (credit:Jeff Spicer via Getty Images)
June 2017: Julia Stiles and Preston J Cook(22 of31)
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Julia Stiles revealed she is expecting her first child with fiancé Preston J Cook. (credit:Karwai Tang via Getty Images)
June 2017: Jaime Pressly(23 of31)
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Jaime Pressly announced she was expecting twin boy with longtime boyfriend, Hamzi Hijazi. (credit:David Livingston via Getty Images)
June 2017: Luisa Zissman and Andrew Collins(24 of31)
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Luisa Zissman announced she was expecting her third child, and second with husband Andrew Collins, on 8 June 2017. (credit:Mark Cuthbert via Getty Images)
May 2017: Cheska Hull(25 of31)
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Former 'Made in Chelsea' star Cheska announced she was pregnant with her first child with her boyfriend Tom Huggett. (credit:Doug Peters/EMPICS Entertainment)
May 2017: Billi Mucklow and Andy Carroll(26 of31)
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Former TOWIE star Billi Mucklow announced she's expecting her second child with her partner Andy Carroll. They are already parents to two-year-old Arlo. (credit:Mike Marsland via Getty Images)
May 2017: Rag 'N' Bone Man and Beth Rouy(27 of31)
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Rag 'n' Bone Man and his girlfriend Beth are reportedly expecting their first child together. (credit:Bill McCay via Getty Images)
May 2017: Cara De La Hoyde and Nathan Massey(28 of31)
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Cara De La Hoyde revealed she is pregnant with her 'Love Island' co-star's baby, weeks after they split following a year of dating.

The couple, who met for the first time on the ITV show in 2016, broke up two weeks after Cara found out she was expecting their baby.

De La Hoyde said Massey will be supporting her throughout her pregnancy.

She told OK! magazine: "I know a lot of people will think, well you're going to have a baby together so just stay together – but we're not going to do that just to look like the perfect couple."
(credit:Jeff Spicer via Getty Images)
May 2017: Laura Tobin(29 of31)
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Laura Tobin announced she is pregnant with her first child with her husband Dean Brown, during a live broadcast on Good Morning Britain.

Her baby is due in October.
(credit:Karwai Tang via Getty Images)
April 2017: Serena Williams And Alexis Ohanian(30 of31)
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Serena Williams accidentally announced her pregnancy when she mistakenly posted a private photo of her baby bump to Instagram with the caption "20 weeks".

The 35-year-old found out she was expecting her first baby with her fiancé, Reddit founder Alexis Ohanian, two days before competing in the Australian Open in January.
(credit:Jamie McCarthy via Getty Images)
April 2017: Ferne McCann(31 of31)
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Ferne McCann confirmed she was expecting her first child with ex boyfriend Arthur Collins. (credit:Karwai Tang via Getty Images)