Behind a big cut-out of Trent, Bellingham was ready to pounce on his England team-mate.
In the clip, the former Borussia Dortmund star was heard saying: "[I've been waiting] about 20 minutes. He just text me saying he's coming."
When Arsenal's Bukayo Saka came into view and asked what was going on, Bellingham replied: "Trying to scare Trent. We've been planning it all morning."
When Trent finally appeared, Bellingham jumped out from his hiding place and tried to startle him, before laughing. The pair embraced and posed for a photo, too.