Not to mention, the introduction of her new 'mumsy' hairdo!
It has been reported previously that Kate isn't into big birthdays and prefers a small soiree with a collection of close family and friends, so we're betting it will be everyone over to Amner Hall for party rings and cocktail sausages. Maybe a round of pass the parcel?
We hope Kate has a memorable day with her family and next year is her best yet.
Here are all the things we hope the next year brings Princess Kate...
1. Have Adele sing at her birthday
We love this picture of Kate singing to herself whilst listening to her iPod back in 2007, and we have since learnt that one of the Duchess of Cambridge's favourite artists is none other than Adele. There has been much speculation about the possibility of her performing at Kate's birthday. A source told Heat magazine; 'Kate has been a huge fan of Adele since her first album 19 and decided to reach out to her after 25 was released.' We hope your birthday wish comes true Kate!
2. Makes friends with other mums at George's nursery
George may only just have started at the Westacre Montessori School in Norfolk, but we are sure that both Kate and George are going to be a hit with the Parents Association and the mum's afterschool groups. Maybe they can arrange some play dates at Amner Hall?
3. Wear traditional clothing in Bhutan and India
We absolutely loved when Kate and Wills wore traditional dress, including a flower crown, on their Royal Tour of the South Pacific in 2012. Now it has been confirmed the pair will make an official visit to Bhutan and India (her first trip to the Commonwealth) this spring, we are hoping for more beautiful outfits!
4. Welcome a third baby
Now we know this one is a long shot, but in the past Kate's family members have alluded to a bigger family. Kate's uncle Gary Goldsmith told Hello! magazine; 'I don't think they'll stop at two.' We hope you're right Gary! We are keeping our fingers crossed for another royal tot - a cheeky youngest just like their uncle Harry.
5. Continue her charity work
Kate has spoken before about how important her charity commitments are, and is patron of many groups including Action on Addiction, East Anglia’s Children’s Hospices The National Portrait Gallery and SportsAid. The end of 2015 saw a full schedule of royal engagements across the UK, and we hope Kate continues to do her good work next year!
6. Get a chance to drink more wine in public
As a mother-of-two, who wouldn't want all royal engagements to happen in a vineyard? Hey Prince Harry?
7. Continue to improve her photography skills
With every milestone for Prince George and Princess Charlotte we are treated to more of Kate's professional looking snaps. Now we don't know if Kate is into YouTube tutorials or has a professional photographer on speedial, but she sure knows how to take a photo worthy of a mantlepiece. We only hope she gets to share more and more of her pictures with us this year!
8. Learn how to do a Scout handshakeKate might be a volunteer Scout Leader and worked frequently alongside the scout groups near her former home in Anglesey, Wales. But the Duchess still struggled to work out the Scout handshake, performed with the left hand, when she visited a group in North Wales. Keep trying mum!
9. Hear Princess Charlotte say her first words
We remember so clearly when the second royal pregnancy was annouced, it seems time has flown by since then, and in the Royal family Christmas card we couldn't help but notice how grown up beautiful Charlotte looks. We hope that 2016 is the year that mum and dad get to hear her first words - we're hoping it will be 'mum' to make it extra special for you Kate!
10. Celebrate her fifth wedding anniversary with Wills
The 29th April 2016 will mark the couple's fifth wedding anniversary, that's right - it's half a decade since we had that wonderful Bank Holiday and saw that famous balcony kiss! We hope William treats you to something worthy of a princess.
11. Learn how to take a selfie
Kate now we know you might be a professional photographer these days but you still haven't worked out how to take a proper selfie - we need to be looking at the camera, not into the crowd! Oh well, this fan doesn't look too disappointed with the results.
12. Mingle with more celebrities
There is nothing we love more than seeing weird celebrity hybrids and this is one we never thought we would see - Queen Bey meeting the Princess. Back in December 2014, during a trip to New York, Wills and Kate met with Jay Z and Beyonce in one of the best celebrity meetings we've ever seen. It must be nice to have someone else to discuss celebrity parenting techniques with!
13. Sell her own food
It is no secret that Kate loves cooking for her family, she is regularly spotted in the aisles of supermarkets doing the weekly shop. But it was annouced this year that she may be planning to open her own organic food business with sister Pippa. Although it sounds a bizarre pursuit for a royal, her father-in-law Prince Charles already has his own range of meats and dairy products - Duchy Originals - stocked in Waitrose, so stranger things have happened...