Sienna Miller: Tippi Hedren for HBO's 'The Girl'!

Check out these first look pics of Sienna Miller as Tippi Hedren in the upcoming HBO film The Girl!

The 30-year-old actress plays the legendary film star in the film about director Alfred Hitchcock‘s obsessive relationship with the actress, who starred in his films The Birds and Marnie. Tippi is even lending her support to the film to vouch for its authenticity.

PHOTOS: Check out the latest pics of Sienna Miller

Toby Jones takes on the role of Hitchcock in the film. Make sure to watch the premiere of the film on October 20 on HBO!