prince louis
Prince George and Princess Charlotte held their dad's hand as they walked in.
He will be christened at 4pm today.
It will be at a different chapel to Princess Charlotte's.
And Prince Louis has hand-me-downs from his big sister, too.
The adorable shots were taken by the Duchess of Cambridge at their home in Kensington Palace.
Teach him how to say and spell his name, preferably as soon as possible