Katherine Heigl shares first photo of son Joshua Bishop Jr. -- see the sweet family pic!


Katherine Heigl and husband Josh Kelley proudly introduced their son, Joshua Bishop Jr., to the world on Wednesday.

The 38-year-old actress Instagrammed an adorable photo of the couple snuggling with their newborn, who was born on Dec. 20.

"@Joshbkelley and I are beyond thrilled to finally share the arrival of our little man Joshua Bishop Kelley Jr. born December 20th, weighing in at 7 pounds 15 ounces," Heigl wrote. "We are all happy, healthy and beyond grateful!"

WATCH: Katherine Heigl Welcomes Baby Boy With Husband Josh Kelley

She also thanked all her fans for their support.

"And one more GIANT thank you to all of you for your wonderful words of support, love and all those beautiful well wishes!" she added. "As always I am incredibly grateful to have such wonderful fans!"

Joshua Jr. joins older sisters Naleigh, 8, and Adalaide, 4, in the family of five. Heigl revealed how she shared the news that she was pregnant with Naleigh and Adalaide -- whom she adopted in 2009 and 2012, respectively -- in a new interview with People.

Happy New Years Eve from the Kelley girls! Here's to a spectacular, joyful abundant 2017 for all! 🎉👏😘

A post shared by Katherine Heigl (@katherineheigl) on

"[The news] was a little confusing for the girls because they'd be like, 'I grew in your tummy?' And I had to explain, 'Well, you didn't actually grow in my tummy, but your dad and I are your parents,'" she shares.

The Heigl family is no stranger to adoption. Heigl's older sister, Meg, was adopted from Korea.

Happy Birthday to my sister @meggie_may_ca the coolest chick I know! Love love love love love love love!!!! 🎂🎉😘

A post shared by Katherine Heigl (@katherineheigl) on

"My mother used to say this too: 'It doesn't matter how they come into your life,'" the former Grey's Anatomy star tells the magazine. "'The moment they put that child into your arms -- whether you just [gave birth] or whether they just arrived from Korea -- they're yours.'"

WATCH: EXCLUSIVE -- Katherine Heigl Says Her Daughters Are 'So Excited' for a Baby Brother

ET talked to the Doubt star in September, when she adorably talked about struggling with "pregnancy brain."

"Usually I'm pretty good at memorizing," she explained. "I can do that pretty quickly. It's like the only thing I've got. So, it's really been eye-opening to me to struggle with that."

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LOS ANGELES, CA - AUGUST 25: Actress Katherine Heigl (R) and husband Josh Kelley attend the 66th annual Primetime Emmy Awards at Nokia Theatre L.A. Live on August 25, 2014 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0163 -- Pictured: (l-r) Actress Katherine Heigl during an interview with host Jimmy Fallon on November 14, 2014 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - NOVEMBER 14: Actress Katherine Heigl is seen in midtown on November 14, 2014 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - NOVEMBER 14: Actress Katherine Heigl is seen walking in Soho on November 14, 2014 in New York City. (Photo by Raymond Hall/GC Images)
BEVERLY HILLS, CA - MAY 06: Katherine Heigl attends ASPCA Celebrates Its Multi-Million Dollar Commitment To Los Angeles' Animals on May 6, 2014 in Beverly Hills, California. (Photo by Stefanie Keenan/Getty Images for ASPCA)
UNITED STATES - circa 2000: Actress Katherine Heigl. (Photo by The LIFE Picture Collection/Getty Images)
PASADENA, CA - JULY 20: Actress Katherine Heigl attends the WB Summer TCA Press Tour on July 20, 1999 at the Ritz-Carlton Hotel in Pasadena, California. (Photo by Ron Galella, Ltd./WireImage)
SANTA MONICA, CA - AUGUST 6: Actor Jason Behr, actress Katherine Heigl, actress Shiri Appleby, actress Majandra Delfino and Brendan Fehr attend the Second Annual Teen Choice Awards on August 6, 2000 at the Barker Hangar, Santa Monica Air Center in Santa Monica, California. (Photo by Ron Galella, Ltd./WireImage)
LOS ANGELES, CA - SEPTEMBER 16: Actress Katherine Heigl poses in the pressroom with her Emmy for 'Outstanding Supporting Actress in a Drama Series' for 'Grey's Anatomy' poses in pressroom during the 59th Annual Primetime Emmy Awards at the Shrine Auditorium on September 16, 2007 in Los Angeles, California. (Photo by Ethan Miller/Emmys/Getty Images for FOX)
GREY'S ANATOMY - ABC's 'Grey's Anatomy' stars Jessica Capshaw as Arizona Robbins, Chandra Wilson as Miranda Bailey, Katherine Heigl as Isobel 'Izzie' Stevens, Justin Chambers as Alex Karev, Eric Dane as Mark Sloan, Sandra Oh as Cristina Yang, Ellen Pompeo as Meredith Grey, Patrick Dempsey as Derek Shepherd, Sara Ramirez as Callie Torres, James Pickens, Jr. as Richard Webber, Chyler Leigh as Lexie Grey and Kevin McKidd as Owen Hunt. (Bob D'Amico/ABC via Getty Images)
Sandra Oh, Katherine Heigl and Sara Ramirez of 'Grey's Anatomy', winner Outstanding Performance by an Ensemble in a Drama Series (Photo by J. Vespa/WireImage)
WFHC's Debra Farmer, Katherine Heigl and WFHC's Jeff Miller (Photo by E. Charbonneau/WireImage)
WEST HOLLYWOOD, CA - SEPTEMBER 16: Actress Katherine Heigl attends the NBC & Vanity Fair 2014 - 2015 TV season event at HYDE Sunset: Kitchen + Cocktails on September 16, 2014 in West Hollywood, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - AUGUST 25: Actress Katherine Heigl attends the 66th Annual Primetime Emmy Awards held at Nokia Theatre L.A. Live on August 25, 2014 in Los Angeles, California. (Photo by Jeff Vespa/WireImage)
LOS ANGELES - APRIL 30: Actress and activist Katherine Heigl visits the ladies of THE TALK, Wednesday, April 30, 2014 on the CBS Television Network. From left, Boy George, Katherine Heigl, and Sharon Osbourne. (Photo by Lisette M. Azar/CBS via Getty Images)
BEVERLY HILLS, CA - MAY 06: Actress Katherine Heigl attends the American Society for the Prevention of Cruelty to Animals celebrity cocktail party on May 6, 2014 in Beverly Hills, California. (Photo by Allen Berezovsky/WireImage)
STATE OF AFFAIRS -- 'Pilot' -- Pictured: (l-r) Tommy Savas as Dashiell Greer, Sheila Vand as Maureen James, Katherine Heigl as Charleston Tucker -- (Photo by: Michael Parmelee/NBC/NBCU Photo Bank via Getty Images)
STATE OF AFFAIRS -- 'Pilot' -- Pictured: Katherine Heigl as Charleston Tucker -- (Photo by: Michael Parmelee/NBC/NBCU Photo Bank via Getty Images)
STATE OF AFFAIRS -- 'Pilot' -- Pictured: (l-r) Sheila Vand as Maureen James, Katherine Heigl as Charleston Tucker -- (Photo by: Michael Parmelee/NBC/NBCU Photo Bank via Getty Images)
STATE OF AFFAIRS -- 'Pilot' -- Pictured: Katherine Heigl as Charleston Tucker -- (Photo by: Michael Parmelee/NBC/NBCU Photo Bank via Getty Images)
STATE OF AFFAIRS -- 'Pilot' -- Pictured: Katherine Heigl as Charleston Tucker -- (Photo by: Michael Parmelee/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - MARCH 25: Katherine Heigl on the set of 'State of Affairs' on March 25, 2014 in New York City. (Photo by Bobby Bank/WireImage)
LOS ANGELES, CA - FEBRUARY 27: Actress Katherine Heigl arrives at Unite4good And Variety Host 1st Annual Unite4:humanity Event on February 27, 2014 in Los Angeles, California. (Photo by Jon Kopaloff/FilmMagic)
LOS ANGELES, CA - FEBRUARY 27: Actress Katherine Heigl arrives at the 1st Annual unite4:humanity event hosted by unite4:good and Variety at Sony Studios on February 27, 2014 in Los Angeles, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
LOS ANGELES, CA - JANUARY 11: Actress Katherine Heigl attends the premiere of 'The Nut Job' at Regal Cinemas L.A. Live on January 11, 2014 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - JANUARY 10: Actress Katherine Heigl is seen at Universal City Walk on January 10, 2014 in Los Angeles, California. (Photo by Paul Archuleta/GC Images)
NEW YORK, NY - FEBRUARY 13: Jena Malone and Katherine Heigl pose during the J. Mendel Fall 2013 Mercedes-Benz Fashion Show at The Theater at Lincoln Center on February 13, 2013 in New York City. (Photo by Kris Connor/FilmMagic)
NEW YORK, NY - FEBRUARY 13: Actors Jena Malone and Katherine Heigl attend the J. Mendel Fall 2013 fashion show during Mercedes-Benz Fashion Week at The Theatre at Lincoln Center on February 13, 2013 in New York City. (Photo by Mike Coppola/Getty Images for Mercedes-Benz Fashion Week)
NEW YORK, NY - FEBRUARY 11: Katherine Heigl is seen during Fall 2013 Mercedes-Benz Fashion Week at Lincoln Center for the Performing Arts on February 11, 2013 in New York City. (Photo by John Parra/WireImage)
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