The day which we're sure was filled with love, family and jewellery, was however, missing one key player, her husband, Prince William.
"Well done for remembering", the Queen's grandson, 36, said as he looked over the card and thanked the children, as captured in a video from royals reporter Rebecca English on Twitter.
Prince William Is Working On Kate Middleton's Birthday, But He Didn't Forget Her Big Day
Over the coming year, the Cambridges' middle child Charlotte is set to turn four in May and then start school in September, when she will most likely join George at private school Thomas's Battersea.
Catherine is thought to have celebrated her birthday with a low-key event at Kensington Palace on Wednesday.
Kate and Prince William have already birthed three children (George, Louis, and Charlotte) in a bid to crush Royal newcomer Meghan Markle's claim to mummy fame by springtime.
London's Air Ambulance account have said that staff are "so proud" to be celebrating the 30th anniversary of the service being founded with the Duke of Cambridge, the charity's medical director has said.
Kate also suffered from extreme bouts of morning sickness whilst pregnant with her three children, in addition to fits of rage alternated with acute sadness topped with subtle hints of hopelessness, which have not been reported to date.
When someone asked what the royal would be doing to mark Kate's big day, he jokingly replied, "That would be telling!"
Girl has no link to kidnapper: Grandfather
Jayme's aunt Sue Allard told Minnesota newspaper the Star Tribune that she could barely express her joy after learning the news. Barron County Sheriff Chris Fitzgerald said investigators are trying to figure out what happened to Jayme during her captivity.
Syria says air defences shoot down Israeli missiles
Just half an hour before midnight, sounds of explosions were heard in Damascus, especially in the western part of the city. On that occasion, a Syrian anti-aircraft missile flew into Israeli airspace, and was destroyed by Israeli air defenses.
Poland arrests Chinese businessman suspected of spying
It has also become involved in the US-China trade dispute after the arrest last month of chief financial officer Meng Wanzhou . Huawei is one of the "tech" champions in China, and one of the more popular Chinese companies overseas .
Lexar just unveiled a 1TB SD card you can actually buy
The 1TB SDXC card is from Lexar's Professional 633x range that offers read speeds of up to 95MB/s and write speeds of up 70MB/s. So, the Lexar's latest SD card is the first commercially available 1TB SD card you can actually buy.
Fish deaths mean NSW water plan 'failed'
Up to a million fish have died in an Australian river in "an ecological catastrophe on an worldwide scale". Debate is raging about how to manage the Murray Darling River in order to prevent more fish deaths .