Brad Pitt, Angelina Jolie Brad Pitt, Angelina Jolie

America's royal couple, Brad Pitt and Angelina Jolie, met with their British counterparts, Prince William and Princess Kate Middleton, on Friday.

The foursome met privately at Kensington Palace for afternoon tea and "discussed their shared interest in combatting the illegal wildlife trade," a spokesperson tells Us Weekly.

Pitt and Jolie's children did not accompany them on their trip overseas; however, Prince George tagged along with his parents to the meeting, Us reports.

"Brad and Angelina spent much longer with the Duke and Duchess than planned," a source told Us. "They ended up staying for almost a few hours."

Jolie, who is involved in U.K. foreign policy, is scheduled to have lunch at the Foreign & Commonwealth Office on Monday.

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