Speaking to 

“I personally, with having a baby, feel like I deserve a really good hangover,” she joked. “I’ve been so good, I’ve been so busy. I’ve been breastfeeding like crazy and I just want some martinis. I want to sleep in. [That’d be] really nice.”

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Kourtney Kardashian

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The eldest of the Kardashian crew celebrated her 4-0 on April 18.

“When she talked about turning 40 a while back, she didn’t seem too excited,” a source told PEOPLE. “Turning 40 is a big deal. But instead of seeing it as something negative, Kourtney turned it around and she seems very excited about her life just in general.”

“She’s been through a lot, personally, over the last decade and feels she’s come out stronger and happier,” added the source. “So she’s excited about turning 40 and what’s to come.”

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Adam Levine

Jeff Kravitz/FilmMagic

The singer spent his 40th — March 18 — on an epic birthday trip to Mexico with friends and wife Behati Prinsloo. 

“I feel like I’m Benjamin Button-ing. I feel younger and less mature, better-looking and just overall more youthful,” the Maroon 5 frontman — referencing Brad Pitt’s film in which a man ages backwards — joked to PEOPLE in February. “Maybe I was born old!”

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Chris Pratt

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The actor is already having a banner year with 

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Tiffany Haddish

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Mindy Kaling & BJ Novak

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The 

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Busy Philipps

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In her 40th year the actress — whose birthday is June 25 — launched her own successful talk show. 

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Jason Momoa

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In December 2018, the actor told 

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John Krasinski

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It’s hard to believe, but somehow, babyfaced Jim Halpert is turning 40 on Oct. 20.

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Claire Danes

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It’s hard to believe Danes was just 15 when she starred on 

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Brandy

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It seems like just yesterday the 

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Kevin Hart

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No joke: Hart turns 40 on July 6.

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Jennifer Love Hewitt

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“A lot of my friends have already turned 40, and in watching them and my husband, there’s this settling in with who you are and being OK with it that’s lovely,” Hewitt, who turned 40 on Feb. 21, told 

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James McAvoy

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Another April birthday babe, the Scottish star turns 40 on April 21.

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Pink

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Though she hasn’t said much about turning 40 on Sept. 8, we imagine the singer will handle the milestone as she does everything in life: with passion and awesomeness.

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Rosamund Pike

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Jordan Peele

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Maggie Q

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Evangeline Lilly

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The 

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Rosario Dawson

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Speaking to

“I think there are times when you take birthdays for granted, and I really want to take advantage of the fact that reaching 40 in my generation is different than it was for my grandmother and for my mom,” Dawson said. “I don’t know if I’m going to go jump from a helicopter or do a bungee jump, but I want to be out there, celebrate, and be in appreciation of who I get to share this with — and that will be my sweet 16 year old.”

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Rider Strong

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Rachael Leigh Cook

Paul Archuleta/Getty

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Jesse Bradford

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Mena Suvari

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Another teen star all grown up: Suvari turned 40 on Feb. 13.

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Joel & Benji Madden

Jerritt Clark/Getty

It was twice the celebrating for the Good Charlotte rockers when they celebrated their 40th birthdays on March 11.

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Rose Byrne

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The 

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Aaron Paul

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He played a young 20-something on 

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Holly Madison

The 

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Pete Wentz

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Fall Out Boy no more: Wentz turns 40 on June 5.

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Lance Bass

Splash News

Another boy bander with a big birthday this year: Bass, who turns 40 on May 4.

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La La Anthony

Mike Coppola/Getty Images for InStyle

The Kardashian family bestie will no doubt have a big bash when she celebrates 4-0 on June 25.

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Sara Bareilles

Josh Lehrer

She’s not going to write you a love song, but maybe she’ll sing “Happy Birthday” on her Dec. 7 birthday.

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Oscar Isaac

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Kelly Ripa told Isaac “life begins at 40” during a visit to 

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Tatyana Ali

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The 

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Ne-Yo

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He may be turning 40 on Oct. 18, but he’s still got the moves of someone half his age.

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Adam Brody

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Seth Cohen just keeps growing up: Brody turns 40 on Dec. 15.

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Jennifer Morrison

Matt Baron/REX/Shutterstock

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Coco Austin

Paul Archuleta/FilmMagic

“So this is what 40 looks like,” Austin wrote alongside some sexy birthday party pics from her March 17 bash. “I have to say this age is pretty damn awesome!”

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Lake Bell

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In a 2017 interview with 

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Jaime King

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“I’m so excited,” King said ahead of her 40th, April 23, on an episode of

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Dania Ramirez

Rebecca Sapp/Getty

Proving age really is just a number, the eternally youthful actress turns 40 on Nov. 8.

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Luke Evans

Give five hurrahs, give twelve hip-hips: 

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Natasha Lyonne

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Before turning 40 on April 4, the actress actually said she was excited for 50. During a sit-down for

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Chris Klein

Lyonne’s 

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Flo Rida

With all that energy, it’s hard to believe the rapper will be over the hill on Sept. 17.

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