'10 Things I Hate About You' star Julia Stiles has announced her first pregnancy.

Actress Julia Stiles has announced her pregnancy with fiancé Preston J Cook.

The 10 Things I Hate About You star will give birth to their first child later this year, People confirms.

In a photo taken on Monday with British radio presenter Nick Snaith, Stiles is seen cradling her growing bump.

Julia Stiles speaks to Magic Radio. Image: Getty.

Stiles, 36, first met Cook on the set of 2015 film Go With Me, where he worked as a camera assistant.

They got engaged during the Christmas holidays two years ago, but they've been in no hurry to exchange vows just yet.

Julia Stiles with Preston J. Cook at the BAFTAs in February. Image: Getty.

Stiles is currently in London promoting her new 10-part TV thriller, Riviera.

Congratulations to the happy couple!

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