The Queen has invited the Middletons for tea at Sandringham following Princess Charlotte's christening on Sunday.
She will host a "low-key" reception at her private residence in Norfolk for family and friends after an "informal" service at the local parish church on her Norfolk estate, the Mail understands.
Guests include the Duchess of Cambridge's parents Carole and Michael and siblings Pippa and James - as well as Charlotte's godparents and their partners.
Only a handful of royals, including Prince Charles and the Duchess of Cornwall, will be present among the two dozen or so guests, with doting uncle Prince Harry missing out as he is currently on a conservation mission in Africa.
Also present will be Prince William and Kate's nanny, Maria Borrallo, who will accompany the royal party as they walk from the Queen's home to St Mary Magdalene Church. Prince George, who turns two later this month, is expected to make the quarter-mile journey largely on foot.