Brad Pitt and Angelina Jolie met with Britain's Duke and Duchess of Cambridge.
The 'Fury' star reportedly attended a tea with his wife and the two royals yesterday, after trying to organise a date for months.
A source shared: "Everyone got on splendidly.
"Brad and Angelina spent much longer with the Duke and Duchess than planned. They ended up staying for almost a few hours."
However, the meeting wasn't just a jolly as the group are believed to have discussed their shared stance on the illegal wildlife trade.
A spokesperson told Us Weekly magazine: "The Duke and Duchess of Cambridge met with Brad Pitt and Angelina Jolie Pitt at Kensington Palace on Friday afternoon.
"They discussed their shared interest in combatting the illegal wildlife trade."
The two couples will have no doubt been swapping parenting tips, with the Duke and Duchess's two-year-old son Prince George believed to be in attendance at the meeting.
Brad and Angelina - who have Maddox, 13, Pax, 11, Zahara, 10, Shiloh, nine, and six-year-old twins Knox and Vivienne - are also believed to have offered the royal couple a present for their newborn baby, Princess Charlotte.