This is the sweet picture Kate Middleton sent well-wishers after Prince Louis' christening

When all you get these days in the post are bills and ads (I'm not old, you're old), it's actually quite nice to get a thank you card now and then. Now imagine getting a thank you card from the Royals, that's a whole other level.

Instagram user @loopycrown3 has received more than her fair share, as she's a self-proclaimed monarchist who writes to the Royal family a lot to wish them well during important events.

She recently shared the thank you card Kate Middleton sent her to thank her for her well wishes for Prince Louis' christening, and it was adorable.

On the front was the Cambridges' favourite picture of the day, one that they loved so much, they shared it as an additional bonus on the Palace's Instagram feed, featuring a beaming Kate and her baby in their formal wear.

Inside the card was the following message: 'The Duke and Duchess of Cambridge were touched that you took the trouble to write on the occasion of the Baptism of their son, Prince Louis. Their Royal Highnesses are so grateful for all the wonderful messages they have received and send you their warmest thanks and best wishes.'

If you scroll down the feed, you'll also see the thank you card Meghan Markle sent following her birthday, which is a picture of her greeting crowds during an official visit.

It included this message: 'The Duchess of Sussex is so touched you took the troupe to write as you did on the occasion of her 37th birthday. It really was most thoughtful of you and Her Royal Highness sends you her heartfelt thanks and best wishes.'