American Horror Story star Billie Lourd has paid tribute to her late mother Carrie Fisher with her choice of name for her newborn son.

First-time mother Lourd, who did not announce she was pregnant, and fiancé Austen Rydell shared their happy news on social media, posting a photo of their newborn's feet with the caption: "Introducing: Kingston Fisher Lourd Rydell." 

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Fisher's friend and Star Wars co-star Mark Hamill was among those to congratulate the couple, writing: "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."

Lourd's American Horror Story and Scream Queens co-star Emma Roberts, who is pregnant, wrote: "Screaming!!! Love you guys so much."

Lourd, who followed in her mother's footsteps by joining the cast of the most-recent Star Wars trilogy as Lieutenant Connix, is the only child of Princess Leia star Fisher and talent agent Bryan Lourd. Fisher died suddenly at the age of 60 in December 2016.