The royal couple attended the event at St George's Chapel, Windsor Castle, along with other members of the royal family, including Mike and Zara Tindall, who took their oldest daughter Mia, and Princess Eugenie.
The Queen didn't attend the service as she's been experiencing mobility issues, while Prince Charles and the Duchess of Cornwall were also absent from the annual event.
Take a look to see the best photos from the day...
The Duchess of Cambridge looked elegant in blue on Easter Sunday.
Kate stepped out in a fitted coat dress, complete with sleek long sleeves, a striking open collar and waist-cinching belt that highlighted her feminine silhouette.
Mia Tindall made a surprise appearance with her parents, Zara and Mike Tindall, at the Easter Sunday service, looking adorable in a pretty dress.
Sisters Savannah and Isla Phillips joined their dad Peter Phillips at the Easter Sunday service and were pictured walking along with Princess Eugenie.
Princess Eugenie was all smiles as she walked along with her cousin Peter Philips and second cousins Isla and Savannah Philips.
Sisters Isla and Savannah Philips looked adorable in their Sunday best for the special Easter outing.
Prince Edward and the Countess of Sussex were joined by their children, Lady Louise Windsor and James Viscount Severn. Louise and Sophie both twinned in patterned dresses and statement hats.
Prince George and Princess Charlotte were pictured chatting with Dean of Windsor, The Right Revd David Conner.
The Cambridges with the Dean of Windsor, The Right Revd David Conner, after they left the church service on Easter Sunday.
Princess Eugenie shook hands with Dean of Windsor, The Right Revd David Conner.
Zara Tindall looked stylish in a statement polka dot dress on Sunday afternoon.
Prince Edward, Duchess Sophie and Lady Louise also spoke with the Dean of Windsor.
The Duke and Duchess of Cambridge led their family into church.
Kate and William were all smiles as they arrived at the church.
Kate and Charlotte looked lovely in their co-ordinating outfits.