From pop singers and politicians to actors and actresses, there are a lot of stars marking birthday milestones in December 2021! Join Wonderwall.com as we take a look at which celebrities are completing a notable trip around the sun this month… starting with this Australia Zoo scion… He’s all grown up! On Dec. 1, conservationist and wildlife photographer Robert Irwin celebrates his 18th birthday. Robert is the son of the late “Crocodile Hunter” star Steve Irwin. He’s seen here with his “Crikey! It’s the Irwins” co-stars — mom Terri Irwin and sister Bindi Irwin (holding her daughter, Grace Powell).
Keep reading for more milestone birthdays this month…
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On Dec. 1, “Everwood” actor Treat Williams celebrates his 70th birthday.
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She’s free! On Dec. 2, Britney Spears — whose 13-year conservatorship came to an end in November 2021 — celebrates her 40th birthday.
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On Dec. 2, “Scarface” actor Steven Bauer turns 65.
“Singin’ in the Rain” and “West Side Story” icon Rita Moreno turns 90 on Dec. 11.
“House of Gucci” star Jared Leto — who will always be Jordan Catalano from “My So-Called Life” to us — turns 50 on Dec. 26.
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Lucas Hedges, who’s appeared in films like “Manchester by the Sea,” “Lady Bird” and “Mid90s,” celebrates his 25th birthday on Dec. 12.
On Dec. 11, Hailee Steinfeld — who’s currently starring on “Hawkeye” on Disney+ alongside Jeremy Renner — marks her 25th birthday.
On Dec. 9, three-time Emmy Award winner Beau Bridges walks into his 80s.
Irish music star Sinead O’Connor — who first made waves with her debut studio album, “The Lion and the Cobra,” back in 1987, and her shaved head — turns 55 on Dec. 8.
On Dec. 26, “Game of Thrones” alum Kit Harington marks his 35th birthday.
Soap opera royalty! On Dec. 23, Susan Lucci — who starred as Erica Kane on ABC’s “All My Children” from 1970 to 2011 — celebrates her 75th birthday.
Prolific filmmaker Steven Spielberg — the mastermind behind iconic movies including “Jaws,” “E.T. the Extra-Terrestrial” and “Jurassic Park” — turns 75 on Dec. 18.
On Dec. 30, English pop star Ellie Goulding — who released her latest album, “Brightest Blue,” in 2020 and welcomed a baby boy in 2021 — celebrates her 35th birthday.
Ricky Martin will continue “Livin’ La Vida Loca” when he turns 50 on Christmas Day.
Valentina Sampaio — who in 2019 made history when she became the Victoria’s Secret brand’s first openly transgender model — celebrates her 25th birthday on Dec. 10.
On Dec. 29, “Wuthering Heights” and “Peaky Blinders” actress Charlotte Riley turns 40.
“Hard on Yourself” hitmaker Charlie Puth celebrates his 30th birthday on Dec. 2.
On Dec. 22, rapper DaBaby — who sparked headlines in July when he made anti-gay comments at the Rolling Loud Festival — will join the 30s club.
Emmy-nominated “The Morning Show,” “The League” and “Safety Not Guaranteed” actor Mark Duplass turns 45 on Dec. 7.
Diane von Furstenberg — the iconic fashion designer behind the famous wrap dress — turns 75 on New Year’s Eve!
On Dec. 27, “Lost” and “Once Upon a Time” actress Emilie de Ravin walks into her 40s.
Former One Direction member Louis Tomlinson — whose debut studio album, “Walls,” was released in 2020 — turns the big 3-0 on Dec. 24.
On Dec. 1, “The Crown” actor Jeremy Northam will join the 60s club.
On Dec. 14, Migos rapper Offset — who’s married to Cardi B — turns 30.
On Dec. 8, “The Lord of the Rings” actor Dominic Monaghan marks his 45th birthday.
Dick Wolf — the mind behind the “Law & Order” and “Chicago” franchises — turns 75 on Dec. 20.
On Dec. 6, actress Lindsay Price — who’s been on everything from “Beverly Hills, 90210,” “All My Children” and “The Bold and the Beautiful” to “Lipstick Jungle” and “Eastwick” — turns 45.
On Dec. 14, Celia Weston — who came to fame as Jolene on TV’s “Alice” and went on to appear in movies including “Dead Man Walking,” “The Talented Mr. Ripley,” “Hulk,” “The Village” and more — turns 70.
On Christmas Day, Justin Trudeau — the prime minister of Canada — will celebrate his milestone 50th birthday.
“High School Musical: The Musical: The Series” actor Joshua Bassett — who will next appear in the Disney comedy-drama flick “Better Nate Than Never” — celebrates his 21st birthday on Dec. 22.
“Dopesick” actress Kaitlyn Dever turns 25 on Dec. 21.
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