Meghan Markle and baby Archie cheer on Prince Harry at the polo

The pairs adorable appearance comes just days after Archie's christening which took place at Windsor Castle on July 6.

Wearing a khaki dress, doting mum Meghan was seen planting a sweet kiss on Archie as they watched Prince Harry compete at the King Power Royal Charity Polo day on Wednesday in Berkshire.

Joining Meghan and Archie was Kate Middleton and her three children who went along to support Prince William who was also taking part.

The Duchess of Cambridge looked stunning in a pink dress and wedges to match.

Kate and Meghan's family outing comes after Buckingham Palace sources revealed to New Idea that the pair exchanged heated words during a rehearsal for Archie's christening.

“Tensions have been brewing between Kate and Meghan for a while, so no-one was surprised that it all boiled over at the christening rehearsal,” says a insider.

“Meghan basically went after Kate while there was a break in the rehearsal – it was very heated and the whole Palace is talking about it.

"It started when Meghan asked Kate not to do anything to steal her thunder at the christening. Kate was pretty taken aback and said she would never do that, which only set Meghan off more.”