Billie Lourd has announced that she has welcomed her first child with fiancé Austen Rydell, in a post which has surprised many who hadn't realised she was even pregnant.

The 28-year-old daughter of Carrie Fisher has paid tribute to her late mother with her name and even posted a photo of her little one in what looks like Star Wars clothing.

Billie, who is a star of TV anthology series American Horror Story, had not previously revealed she was expecting.

The birth of a boy has come just three months after confirming she was engaged to Austen.

Alongside a picture of the newborn's tiny feet, Billie wrote: "Introducing: Kingston Fisher Lourd Rydell."

Billie Lourd welcomes her first child

Among the first to congratulate Billie was Carrie's Star Wars co-star Mark Hamill, who played Luke Skywalker to her Princess Leia.

He wrote on social media: "Congratulations to #BillieLourd & #AustenRydell on the arrival of their firstborn child: Kingston Fisher Lord Rydell!!! I can't think of another baby with both 'KING' AND 'LORD' in their name. Nice."

There were plenty of Billie's celebrity friends who wanted to share their good wishes, as welll as their surprise that she had become a mother.

Carrie Fisher's daughter Billie Lourd reveals she has welcomed a boy with fiancé Austen Rydell

Her Scream Queens co-star Emma Roberts, herself expecting, said: "Screaming!!! Love you guys so much."

The Lion King star Billy Eichner wrote: "OMGGGGG CONGRATULATIONS!!!!!!!!!!!!"

Unbelievable actress Kaitlyn Dever said: "CONGRATS BILLLIE. IM CRYING."

And Halloween star Jamie Lee Curtis expressed her surprise at the news and commented: "WAIT WHAT????"

Billie and her mum Carrie Fisher on the set of Star Wars: The Force Awakens

Billie, who appeared as Lieutenant Connix in the Star Wars sequel trilogy, is the only daughter of talent agent Bryan Lourd and Fisher, who died aged 60 in 2016.

Billie is considered to be Hollywood royalty.

Not only is her mother beloved by millions of fans for playing Princess Leia in the Star Wars films, but her grandparents are the Hollywood actress Debbie Reynolds and the singer Eddie Fisher.

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