Julia Stiles, 43, reveals she secretly welcomed a third baby with husband Preston Cook five months ago

Julia Stiles is now a mother of three.

The 10 Things I Hate About You star, 43, secretly welcomed a baby with her husband Preston Cook five months ago.

She made the surprise reveal to The New York Times on Wednesday as she discussed her directorial debut film Wish You Were Here.

'I'm kind of like a bundle of emotions, because I have a 5-month-old baby and I went into directing my first movie,' Stiles said.

The New York City native did not share the baby's sex or date of birth. 

Stiles and Cook, who wed in 2017, also share two sons: Strummer, six, and Arlo, two.

Julia Stiles is now a mother of three. The 10 Things I Hate About You star, 43, secretly welcomed a baby with her husband Preston Cook five months ago; seen in 2021

She acknowledged to the NYT that she 'didn't really talk about' her third pregnancy publicly.

Stiles then pivoted the conversation to directing and how motherhood has helped 'train' her.

'I think that actually being a mom is really great training for being a director. You have to think 10 steps ahead but also be in the present moment,' she explained.

'You have to be good at time management. You have to be sensitive to people's needs and guide them, but also hold a boundary.'

Along with going behind the camera, Stiles co-wrote the screenplay for Wish You Were Here with Renée Carlino.

It stars Kelsey Grammer, Jennifer Grey and Stiles' younger sister Jane Stiles. 

Wish You Were Here is currently in post-production as it wrapped filming in February.

A release date has yet to be announced. 

The Jason Bourne star met her husband Peter have been together for nearly a decade.

The couple met in 2014 on set of Stiles' thriller film Go With Me (2015) and began dating that same year. 

She made the surprise reveal to the New York Times on Wednesday as she discussed her directorial debut film Wish You Were Here; seen pregnant with second child in November 2021

Stiles and Cook, who wed in 2017, also share two sons: Strummer, six, and Arlo, two; seen in 2019

Cook was working on the production team as a camera assistant. 

He proposed to Stiles in December 2015 while celebrating the Christmas holiday in Isla Grande, Colombia

In June 2017, Stiles announced that she was pregnant with their first child and they tied the knot three months later.

A representative for Stiles told Us Weekly at the time that the wedding took place on the beach in Seattle during Labor day weekend. Two friends were present for the nuptials.

Julia announced in November 2017 that she gave birth to their son Strummer Newcomb Cook the month prior.

She shared the news to Instagram and included an adorable picture of the little one's tiny hand gripping his dad's thumb.

Captioning the snap, Julia wrote: 'Strummer Newcomb Cook, born October 20, 2017. 

'Thanks and ever thanks to the extraordinary Doctors, Nurses and staff at Mount Sinai for helping bring this utter joy into our lives. "Hello, World!" (sic)' 

The Jason Bourne star met her husband Peter have been together for nearly a decade after meeting on a film set in 2014; seen in 2019

In June 2017, Stiles announced that she was pregnant with their first child and the couple tied the knot three months later

Julia announced in November 2017 that she gave birth to their son Strummer Newcomb Cook the month prior

Their son Arlo arrived in January 2022 and Stiles confirmed his birth with an Instagram post

In November 2021, Stiles revealed that she was expecting hers and Cook's second child by debuting her baby bump at the red carpet at a screening of A24's The Humans.

Their son Arlo arrived in January 2022 and Stiles confirmed his birth with an Instagram post.

'Welcome to the world, Baby Arlo! The newest addition to our family, reminding me how infinite love can be,' shared the former teen star.

The first image was of baby Arlo's feet as the child was swaddled in a hospital blanket.