The acting pair announced the surprise birth of their son on social media through two charities they support, the International Network for Aid, Relief and Assistance and War Child USA.
and her husband Thomas Sadoki have welcomed their second child together – with the news coming as a big surprise to fans.
Amanda Seyfried, 34, has given birth to a baby boy but had not revealed she was pregnant.
She already shares three-year-old daughter Nina with the actor, 44.
The pair announced their happy arrival through the social media pages for two charities they support, the International Network for Aid, Relief and Assistance and War Child USA.
As well as an adorable picture of their newborn, they shared a statement with the organisations.
The statement on War Child USA’s page read: “We are so happy to join with INARA to be the first to announce that our ambassadors Amanda Seyfried and Thomas Sadoski welcomed their second child into this world.”
Amanda and Thomas added: “Since the birth of our daughter 3 years ago our commitment to the innocent children that are so brutally affected by conflict and war has been a driving force in our lives.”
“With the birth of our son the work of INARA and War Child has become our North Star.”
Amanda and Thomas married in 2017, around the time that she was close to giving birth to Nina.
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Just last year, Mean Girls star Amanda said she found it hard to plan another baby.
She told People: “If it happens to you, you just make it work. I want to get pregnant again, but I’m not ready just yet to have a second. I would like my daughter to be in school and then have my own time with a new baby. But it’s so hard to plan.”
Amanda, who played Sophie in the two Mamma Mia movies, has a busy time coming up.
Thomas is known for his roles in John Wick and Loser.
He also stars in TV series Tommy and has two movies – Killing Eleanor and The Last Weekend in May – in post-production.
It’s also been announced that he’ll star in film Lemonade.