Reese Witherspoon has revealed her long-time body double - and they look IDENTICAL!

Move over Ava Phillippe ... Because Reese Witherspoon has a new doppelganger!

After working together on five films, the 42-year-old actress has finally introduced her body double to the world - and they could totally pass as identical twins.

Taking to Instagram, the 'Legally Blonde' star shared a video with her look-alike, Marilee Lessley, ahead of filming scenes for the second season of 'Big Little Lies'.

Reese captioned the short clip: "Meet Marilee! She has been my double in 5 movies and now she is helping out on #BigLittleLies! Don't we look alike?!"

With their matching blonde locks, blue eyes, arched brows, and cheerful smiles, you'd think they have been separated at birth.

And adoring fans can't get over just how similar the two look.

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"I first thought she was your daughter. Mirror image. Sound alike too," wrote one.

"She's your secret sister," said another.

A third added: "Omg you found your twin!"

The mother-of-three later revealed the pair have worked together ever since they wowed staff with their striking resemblance on the set of 'Legally Blonde 2'.

"I met Marilee on 'Legally Blonde 2', and she looked so much like me and everybody (was) like, ‘You look so much alike!’ so she became my double," Reese shared.

Marilee has also starred in films such as 'Water for Elephants', 'Just Like Heaven' and 'Evil Angel'.

'Big Little Lies' is expected to be back on screens in 2019.