AceShowbiz -

Julia Stiles is going to be a mother. The "Mona Lisa Smile" star is expecting her first child with fiance Preston J. Cook. Julia debuted her baby bump in London where she was spotted leaving BBC Broadcasting House after an interview with Magic FM's Nick Snaith on Monday, June 12.

Julia was in London to promote her newest series, "Riviera", which is set to premiere on June 15. The mother-to-be looked stylish in a black fitted dress which she paired with red trench coat and green pumps. She accessorized with round gold earrings. The "Jason Bourne" actress was beaming as she was walking down the street.

Nick Snaith took to Twitter to post a photo of him with Julia hours after the interview. In the photo, the radio host put his arm around her shoulders while smiling. Julia was seen cradling her baby bump as she posed for the camera. "Great to see @MissJuliaStiles to chat all things #Riviera on @skyatlantic from this Thurs. She will be on @magicfm #MagicInTheMorning on wed," Nick wrote.

Great to see @MissJuliaStiles to chat all things #Riviera on @skyatlantic from this thurs. She will be on @magicfm #MagicInTheMorning on wed pic.twitter.com/plsVjv4wJp

— Nick Snaith (@nicksnaith) June 12, 2017

Julia's rep has confirmed to PEOPLE that the "Dexter" actress is currently pregnant. She and Preston will welcome their child later this year.