Olivia Wilde 'Very Happy' with Harry Styles, Source Says

#34;They seem very serious," a source tells PEOPLE of Olivia Wilde and Harry Styles who are filming Don't Worry Darling

Olivia Wilde, 36, and Harry Styles, 27, 'seem very serious

Olivia Wilde, 36, and Harry Styles, 27, 'seem very serious

Olivia Wilde is seen returning to the home she shares with now

Olivia Wilde, 36, and Harry Styles, 27, 'seem very serious

Olivia Wilde is seen returning to the home she shares with now

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Don't Worry Darling TRAILER: Harry Styles simulates sex act with

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Olivia Wilde, 36, and Harry Styles, 27, 'seem very serious

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Olivia Wilde is seen returning to the home she shares with now