Fabulous at 40! From Zoe Saldana and Ashton Kutcher to Katie Holmes and John Legend, there's a whole crop of Hollywood stars turning the big 4-0 in 2018. Wonderwall.com rounded up all the bold-faced names hitting the milestone this year, starting with Usher. The R&B crooner will be celebrating his 40th b-day on Oct. 14. Keep reading to see who else is joining him…
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"Avengers: Infinity War" star Zoe Saldana crossed the 40 line on June 19.
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Ashton Kutcher and his twin brother, Michael, turned 40 on Feb. 7.
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John Legend will be celebrating his 40th birthday on Dec. 28.
Katie Holmes will hit 40 on Dec. 18, but she'll always be teenaged Joey Potter to us!
Another "Dawson's Creek" alum, Joshua Jackson, celebrated his 40th birthday on June 11.
Handsome Brit Matthew Goode turned 40 on April 3. He just starred on Season 2 of "The Crown" and can next be seen on "A Discovery of Witches" in early 2019.
"Once Upon a Time" alum Ginnifer Goodwin celebrated her 40th birthday on May 22.
Late-night TV host James Corden turned 40 on Aug. 22.
Maria Menounos celebrated her 40th birthday on June 8.
Former "Mad Men" star January Jones turned 40 on Jan. 5.
Bill Hader celebrated his 40th b-day on June 7.
Swedish beauty Malin Akerman celebrated her milestone 40th birthday on May 12.
Comedian Andy Samberg hit 40 on Aug. 18.
Smoldering Ian Somerhalder hits the 40 mark on Dec. 8.
Gwendoline Christie will celebrate her 40th birthday on Oct. 28 — long before "Game of Thrones" returns in 2019.
Our favorite "Mean Girl" is now a mean woman! Rachel McAdams will be turning 40 on Nov. 17.
"The O.C." alum Benjamin McKenzie joined the 40 club on Sept. 12.
Katherine Heigl — who joined the cast of "Suits" for Season 8 — will celebrate the big 4-0 on Nov. 24.
Former teen heartthrob Josh Hartnett crossed the 40 mark on July 21.
Michelle Rodriguez celebrated her 40th birthday on July 12.
Twin "Sister, Sister" alums Tia Mowry and Tamera Mowry-Housley hit the big 4-0 on July 6.
"Glee" alum Matthew Morrison will celebrate his 40th birthday on Oct. 30 — and we're sure he'll do it in style at his annual charity Halloween bash.
Singer Nicole Scherzinger turned 40 on June 29. The former Pussycat Doll has spent the past couple years based in London working on several television projects.
Portuguese-Canadian singer Nelly Furtado turns 40 on Dec. 2.
Wes Bentley celebrated his 40th on Sept. 4.
Retired NBA star Kobe Bryant celebrated his 40th birthday on Aug. 23.
"New Girl" alum Jake Johnson rang in his 40th birthday on May 28.
Former teen heartthrob Shane West marked 40 years on Earth on June 10.
New dad Tyrese will hit 40 on Dec. 30.
Babyfaced actor Topher Grace turned the big 4-0 on July 12.
Former "Castle" star Stana Katic celebrated her 40th birthday on April 26.
Kumail Nanjiani turned 40 on Feb. 21.
Actress Shannyn Sossamon turned 40 on Oct. 3.
The longest serving cast member on "Saturday Night Live," Kenan Thompson, joined the 4-0 club on May 10.
Forever young Justin Long celebrated his 40th on June 2.
Funnyman Nick Kroll turned 40 on June 5.
"Supernatural" star Jensen Ackles turned 40 on March 1.
Actor Jason Biggs hit 40 on May 12.
Rapper-actress Eve will celebrate her 40th birthday on Nov. 10. Catch her on "The Talk" on CBS.
Mexican actor Gael García Bernal turns 40 on Nov. 30.
Former Nickelodeon star Kel Mitchell joined the 40 club on Aug. 25.
Backstreet Boy AJ McLean became a man of 40 on Jan. 9.
Comedy star Kristen Schaal turned 40 on Jan. 24.
DJ-producer Diplo will celebrate his 40th birthday on Nov. 10.
Jim Sturgess has our heads spinning across the universe because we can't believe the handsome actor turned 40 on May 16.
On Nov. 6, Taryn Manning will turn 40. Hopefully she gets a dress she approves of…
Comedian Billy Eichner turned 40 on Sept. 18. (He's voicing warthog Pumbaa in Disney's upcoming "Lion King" remake!)
"Grace and Frankie" actor Ethan Embry turned 40 on June 13.
"Despacito" singer Luis Fonsi celebrated his 40th birthday on April 15.
"Baywatch" alum Brooke Burns turned 40 on March 16.
Former "American Idol" star Clay Aiken will celebrate his 40th birthday on Nov. 30.
Did we all have a major crush on Devon Sawa back in the day or what?! The former teen heartthrob celebrated his 40th birthday on Sept. 7.
Muse frontman Matt Bellamy entered a new decade on June 9.
Producer Swizz Beatz turned 40 on Sept. 13 and celebrated with a star-studded blow-out bash thrown by wife Alicia Keys in New York City!
Victoria's Secret and Sports Illustrated Swimsuit Issue model Marisa Miller turned 40 on Aug. 6.