McGregor and Winstead welcomed their first child as a couple.
The couple had kept the pregnancy private until Clara McGregor broke the news on Instagram.
McGregor has four other children with his ex-wife Eve Mavrakis.
Ewan McGregor has welcomed his first child with Mary Elizabeth Winstead, his eldest daughter revealed on Sunday.
25-year-old Clara McGregor wrote: "Welcome to the world little brother," alongside a picture of herself holding the newborn boy named Laurie.
McGregor and Winstead have kept the pregnancy private up until the social media post. They have been in a relationship since 2017 after co-starring in the TV series "Fargo." Both were married when they met but have since divorced from their partners.
McGregor has four daughters with his previous wife, the production designer, Eva Mavrakis. The couple were married for 22 years after meeting on the set of the British crime show "Kavanaugh QC." They separated officially in 2017, however, the divorce was finalized three years later in 2020, People reported.
Clara previously publicly called Winstead "a piece of trash" after finding out about her relationship with her father. People reported in 2018 that Clara commented under a photo of the actress, "Most beautiful and talented woman on earth??? Oh man y'all are delusional. The girl is a piece of trash :) x."
She later told The Times of London that she regretted the comment, saying, "There had been a lot building up to it and a lot to deal with, not to make excuses or anything, but, yeah, it wasn't my finest moment."
"It wasn't the right way to go about things, but it's a hard thing to wrap your head around when you feel you had this idea of what the family unit is and then to have that shift," the 25-year-old model added.
Now, Clara was happy to welcome her baby brother saying, "Congratulations to my Dad & Mary. This is the greatest gift."
Clara recently attended a premiere for a film starring her father 30 minutes after being treated for dog bites.
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