We like to think that we have pretty good knowledge about which stars are expecting, but sometimes they shock even us at Mother & Baby with surprising new arrivals. Have a click through our gallery and see the little ones that took us by surprise, whether it's because their famous parents opted for surrogacy, hid their bump from the cameras or chose to adopt in private.
Isla Fisher managed to keep her entire pregnancy under wraps before giving birth to her second daughter with husband Sacha Baren Cohen, Elula in August 2010. In fact, she was such a pro at keeping the news private, her co-stars who she was filming with during her first trimester didn't have an inkling. She later admitted she used savvy dressing and oversized bags and coffee cups to hide her bump!
We were all so busy reeling from the shock breakdown of Sandra Bullock's marriage to Jesse James (news that came shortly after her 2010 Oscar win) that her plans to adopt a little boy named Louis, born in New Orleans, went completely under the radar. Then Sandra popped up on the cover of a US magazine to reveal the news.
The actress and her hubby Keith Urban welcomed a baby girl in 2010, as a sister to Sunday Rose, via a surrogate. The happy couple had previously spoken of their fertility struggles and opted to keep the news secret until Faith had been safely delivered and had joined their family.
Notoriously private (read: hater of the press), Megan never openly spoke of her 2012 pregnancy despite being photographed in a bikini with full bump on show while on holiday with husband Brian Austin Green. Given their 'keep quiet' approach, no-one was ever quite sure of Megan's due date and in fact she only confirmed the arrival of Noah Shannon a good month after his birth.
January 2014 saw 49-year-old actress Laura Linney give birth to her first child, a boy named Bennett Armistead Schauer, having given the press no clue that she was even pregnant. Her trick? Oversized structured dresses on the red carpet and no casual pap pictures.
After finding out that her chances of conceiving naturally were very low - 'it was a womb issue for me, embryos wouldn't implant' - Elizabeth and husband Max decided to use a surrogate to add a son Felix to their family. Elizabeth chose to keep her baby plans to herself, and the identity of son Felix was only revealed after he arrived safely on March 30, 2001, along with the news that the grateful couple remain in contact with the surrogate.
Not a total surprise, but if Angelina had had her way, her 2008 pregnancy would have stayed private until twins Vivienne and Knox were welcomed into the world. However, her Kung Fu Panda co-star Jack Black had different ideas as he put his foot in it and revealed the news during the Cannes Film Festival. Ange had to confirm the pregnancy then and there, and gave birth just two months later. Not cool JB, not cool.
Don't be surprised if you can't remember how you celebrated Christmas or New Year in 2010, as chances are you were reeling from Elton John and David Furnish's shock announcement that they'd become parents to a son Zachary via surrogate. The couple kept the entire process under wraps, and when they did reveal the lovely news, they chose to keep schtum on which of them was the biological father.
This star left our mouths hanging open in March 2012 when she announced she'd been through the adoption process and was now a very happy, proud mum to a little boy called Jackson. She hasn't revealed much more information to this day, but raising Jackson as a single mum doesn't seem to be too big a task for Charlize - she's loving it!
Mum-of-one January Jones may have let us into the fact she was pregnant just a few months before given birth, but she was tight-lipped about the father of her son - and has been ever since! Speaking in May 2013, the actress admitted: 'I don't have room for anything else so I don't know how I would have done it with a partner. I knew I would be raising my son alone. It was something I went in to knowingly, I was prepared mentally and I was excited about it.'
Some celebrities really should know when to keep their mouths shut. At an October 2011 event, actress Octavia Spencer took it upon herself to reveal that her friend and The Help co-star Viola Davis had just become a mum through adoption. 46-year-old Viola and her actor husband Julius later confirmed that they had become parents to a little girl called Genesis.
This actress' pregnancy announcement must have got 'Lost' in the post, as no-one had a clue she was even expecting until a photo of Evangeline sporting a seriously big bump surfaced in April 2011. Still no word from the star herself, and just one month later she welcomed a son with boyfriend Norman Kali!
Now this is what we call a secret pregnancy. The rest of the world didn't even know One Tree Hill actress and boyfriend Jeffrey Dean Morgan were a couple until a joint public appearance in April 2010, but after a little more digging it was discovered that the pair had begun dating in 2009 and had had a baby together during that time.
Denise is another celebrity mum who chose adoption to add to her loving family. While the actress already had daughters Sam and Lola from her marriage with Charlie Sheen, June 2011 saw Denise reveal that baby Eloise Joni had joined the girly crew and was settling into their Hollywood Hills just fine.
We have to give Ricky a nod here as his 2008 baby announcement, courtesy of his official rep, came as a complete surprise to all. Ricky was known to be single after splitting from his long-term girlfriend back in 2005 but the statement delivered Ricky's message loud and clear: 'In recent weeks, Ricky Martin became a proud father by the birth of twin sons. The children, delivered via gestational surrogacy, are healthy and already under Ricky's full-time care.'
Choosing to adopt is probably the biggest decision you’ll ever make. But stick with the steps and legalities and at the end of the process you’ll get something amazing – a child to bring up as your own