Billie Lourd Remembers Carrie Fisher's Birthday With Sweet Instagram Post

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Billie Lourd is remembering her mom on what would have been her 61st birthday. 

The 25-year-old actress took to Instagram on Saturday to pay tribute to Carrie Fisher with a collage of throwback pics -- including one of the pair rocking matching nightgowns.

"Happy Birthday Mom," she wrote in emoji lettering. 

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❤ ♓️🅰️🅿️🅿️✌🏼 🅱️ℹ️🌱✝️♓️👂🏼🅰️✌🏼 ♏️🅾️♏️🅱️✌🏼 ❤

A post shared by Billie Lourd (@praisethelourd) on

Fisher died on Dec. 27 at 60 years old, after going into cardiac arrest on a flight from London to Los Angeles. Fisher's mother, Debbie Reynolds, died just one day later. 

RELATED: Billie Lourd Opens Up About Life Without Carrie Fisher, Being Raised Amid Drug Addiction and Mental Illness

Lourd wasn't the only one to honor Fisher on Saturday. The actress' Star Wars twin, Mark Hamill, and more of Fisher's celebrity friends shared posts on social media. 

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Happy Birthday, your Highness! #carriefisher forever...

A post shared by Kevin Smith (@thatkevinsmith) on

RELATED: Billie Lourd Emotionally Opens Up to Ellen DeGeneres on Losing Mom Carrie Fisher & Grandma Debbie Reynolds

See more on Fisher in the video below.