Prince Charles and Meghan Markle have famously shared a close relationship since Markle joined the royal family earlier this year, and today's appearance at Westminster Abbey was no exception.
The royal pair were caught sharing a giggly exchange as they arrived with other senior royals for the Commonwealth Day service.
The pregnant Duchess appeared to have an animated conversation and she spoke to the Duke in the receiving line to the Abbey.
The Duke made a comment which made his daughter-in-law burst into a fit of giggles, though it is not known what he said to her to prompt the reaction.
Twitter fans were quick to react to the sweet moment, with fans declaring the pair their new "favourite duo".
One tweeted: "One can perfectly see they get along like daughter and father, no doubt about that."
Another added: "I love watching Duchess Meghan and Prince Charles interact". A third added: "Prince Charles and Meghan's relationship is so precious."
The pair were also joined by the Duke of Sussex, the Duchess of Cornwall, the Duke and Duchess of Cambridge, Prince Andrew and the Queen for the service.
Markle wore an all-white ensemble as well as a chain print dress from pal Victoria Beckham's fashion line.