Ryan SeacrestRyan Seacrest. Steve Granitz / Contributor / Getty Images On December 24, Ryan Seacrest will turn 50.Two years ago, Seacrest celebrated his birthday with a family gathering and playing games with balloon animals, according to Instagram. Ricky MartinRicky Martin. Brendon Thorne/Getty Ricky Martin's 53rd birthday is on December 24, 2024.To get into the Christmas spirit, Martin voiced a character in the Netflix holiday film "Jingle Jangle: A Christmas Journey." Dr. Anthony FauciDr. Anthony Fauci. Al Drago/Getty Images The most famous expert on infectious diseases, Dr. Anthony Fauci, will turn 84 on Christmas Eve.Fauci was born on December 24, 1940 and while he might not have been a huge celebrity for the first seven decades of his life, Decade No. 8 is shaping up to be his busiest ever. Louis TomlinsonLouis Tomlinson. Vivien Killilea/GettyImages Louis Tomlinson's 33rd birthday is on Christmas Eve.Tomlinson is the oldest member of One Direction, and the oldest of seven siblings. Jimmy BuffettJimmy Buffett. Getty Jimmy Buffett would have celebrated his 78th birthday on December 25, 2024.Buffett died in September 2023at the age of 76.Of the many,many,albums Buffett released over his decadeslong career, he put out two Christmas albums: 1996's "Christmas Island" and 2016's "'Tis the SeaSon." Stephenie MeyerStephenie Meyer. Amanda Edwards/WireImage/Getty Images "Twilight" author Stephenie Meyer will celebrate her 51st birthday on Christmas Eve.In 2020, Meyer released the eighth installment in the "Twilight" saga, "Midnight Sun," a re-telling of the first "Twilight" book from Edward's perspective. Lee DanielsLee Daniels. Noam Galai/Getty Images for TIME Lee Daniels turns the big 6-5 on December 24 this year.The Oscar-nominated director is celebrating his 65th birthday this year, 19 years after his directorial debut, "Shadowboxer." Barbara MandrellBarbara Mandrell. Mark Humphery/ AP Barbara Mandrell's 76th birthday is this Christmas Day.The iconic country singer released a Christmas album in 1984, "Christmas at Our House." Jeremy StrongJeremy Strong. Jeff Kravitz/FilmMagic via Getty Images Jeremy Strong was born 46 years ago on Christmas Day, 1978.The "Succession" star has a few things to celebrate this year. He's been receiving awards buzz for his performance as Roy Cohn in "The Apprentice" and won a Tony for his role in "An Enemy of the People." Sissy SpacekSissy Spacek. AP Sissy Spacek's 75th birthday is on Christmas Day.The Oscar winner starred in the 2008 Christmas rom-com "Four Christmases." Justin TrudeauPrime Minister Justin Trudeau. Associated Press On December 25, Canadian Prime Minister Justin Trudeau turns 53.At 43 years old, Trudeau was the second-youngest prime minister in Canadian history when he was elected in November 2015. DidoDido. Kieran Doherty/AP Images Dido will also turn 53 on Christmas Day this year.The British singer takes a page out of Paddington Bear's book to celebrate her birthday since Christmas is already a holiday, she celebrates her birthday on June 25, according to The Guardian. Annie LennoxAnnie Lennox. Vera Anderson/WireImage/Getty Images Annie Lennox's 70th birthday is on Christmas Day.The "Walking on Broken Glass" singer released her first and only Christmas album, "A Christmas Cornucopia," in 2010. Helena ChristensenHelena Christensen. Jason Mendez/Invision/AP Danish supermodel Helena Christensen will turn 56 on December 25, 2024.Christensen first gained mainstream recognition 35 years ago when she starred in the music video for Chris Isaak's "Wicked Game."