Twitter account Tea Time With The Cambridges shared the throwback snaps, highlighting that Kate Middleton's christening took place on June 20, 1982 - exactly a day before her future husband was born.
As is tradition, baby Kate Middleton wore a long white lace dress for the occasion - one that mirrors the royal garb her children, Prince George and Princess Charlotte, both wore:
Stay tuned for photos from Prince Louis' christening tomorrow!