The Transformers: Dark of the Moon star confessed that she harbours a crush on the younger royal in an interview on Live With Regis & Kelly.
"I'm waiting for my proposal," said Huntington-Whiteley. "I keep writing [to the palace] and we'll see what happens."
FHM's 'Sexiest Woman In The World' continued: "I think he knows how obsessed I am. Well, he does now! He's so handsome."
Of Harry's brother Prince William's wedding to Kate, Huntington-Whiteley stated: "It was so beautiful that wedding, I loved it."
Asked if she could picture herself at the nuptials as Harry's date, the actress added: "Yeah, for most of my childhood and still now, I'm waiting for the proposal… Come on Harry!"
Watch a trailer for Transformers: Dark of the Moon below:
Huntington-Whiteley recently revealed that Transformers director Michael Bay demands people bring their "A-game" to work, stating that she hopes Bay appreciated her work on Transformers: Dark of the Moon.
The 24-year-old last week compared the process of filming the latest Transformers instalment to "boot camp", claiming that the movie's shooting schedule was hectic.
Huntington-Whiteley replaced Megan Fox in the Transformers franchise last June.
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Watch Rosie Huntington-Whiteley and Michael Bay discuss Transformers: Dark of the Moon with Digital Spy below: