Prince Harry is quite the jokester!

The 31-year-old royal hilariously photobombed an Instagram picture of America's Next Top Model star Winnie Harlow and her agent at the Audi Polo Challenge in London on Saturday, May 28 — and the silly snapshot is seriously one for the books!

"When you’re trying to have a serious convo but your agent and Prince Harry aren’t serious at all. #Photobomb," Winnie, 21, captioned the fun pic.

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Harry was in attendance at the charity event with his older sibling, Prince William, 33. The brothers are competing in a series of 17 polo matches throughout the summer to help raise money for the various charitable organizations they support.