He even paid homage to his late mother Princess Diana with a black and white photo of her on his desk.
The Daily Mail reports the photo of Harry's room was one of several taken when the prince, now 33, was just 18 years old.
The photo didn't go unnoticed by many people, one of which was Halle herself who chose to tweet the image. Other people commented on Prince Harry's poster choices, including Ms. Berry herself, who tweeted at the prince on Wednesday.
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I think his last four performances he has become a man and he is performing at a high level. He's doing the other side of the game very well.
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In March 2002, about a year before the photo was taken, Berry made history by becoming the first African-American woman to win an Academy Award for Best Actress for her performance in "Monster's Ball".
A photo of a teenage Harry sitting in his dorm room at Eton College in 2003 resurfaced showing personal items he kept in his room, including a poster of Halle Berry.
The Oscar victor heard about it and trolled the royal on Twitter, writing, "Ok #PrinceHarry, I see you!" and included an ROFL laughing emoji.