Zoe Saldana shows off impressive post-baby body in 'Guardians of the Galaxy' costume: 'It pays off to work hard'

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Zoe Saldana has a message to her fellow "mommies of the world" when it comes to getting in shape after giving birth: "It pays off to work hard!"

The 37-year-old actress -- who welcomed twin boys, Bowie and Cy, with husband Marco Perego in November 2014 -- took to Instagram on Thursday to show off her fit post-pregnancy physique by rocking one of the skin-tight costume from Guardians of the Galaxy, which she wore in 2013 before getting pregnant.

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"Holy S---! You guys, I had to share this," Zoe captioned the impressive pic. "After twins I can't believe I was able to slip into this!"

The stunning star credited her exercise regimen and her healthy lifestyle for her jaw-dropping figure, which she admitted was "hard work," and assured other mothers, "If I did it you can too."

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Saldana has been very open about her efforts to get in shape after giving birth. In a video she posted to Facebook in April, she even showed how she works out and entertains her young sons at the same time.

Hopefully, her healthy lifestyle won't be derailed by the sweet-tooth temptations of the holiday season -- Saldana has made it clear that she is taking Christmas very seriously this year.

After sharing her super-fit selfie, the Avatar actress posted a video of herself decorating the family's Christmas tree with color-changing lights while listening to "This Christmas" by Wham!.

Wham it up! Are ya'll putting up your Xmas trees?? @georgemofficial #georgemichael #wham #merrychristmas

A video posted by Zoe Saldana (@zoesaldana) on

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In February, Saldana spoke with ET about being a new mom where she revealed that she's "enjoying every minute of it."

See recent photos of Saldana:

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Zoe Saldana shows off impressive post-baby body in 'Guardians of the Galaxy' costume: 'It pays off to work hard'
Zoe Saldana, left, and Mark Ruffalo attend the Los Angeles Premiere of "Infinitely Polar Bear" held at Regal Cinemas L.A. LIVE on Sunday, June 14, 2015, in Los Angeles. (Photo by John Salangsang/Invision/AP)
Zoe Saldana arrives at the Launch Of The Samsung Galaxy S6 And The Galaxy S6 Edge at Quixote Studios on Thursday, April 2, 2015, in West Hollywood, Calif. (Photo by Rich Fury/Invision/AP)
Zoe Saldana seen at "The Book of Life" Portrait Session at The Four Seasons Hotel on Sunday, October 11, 2014, in Los Angeles, California. (Photo by Brian Dowling/Invision/AP)
LAS VEGAS, NV - NOVEMBER 19: Actress Zoe Saldana attends the 16th Latin GRAMMY Awards at the MGM Grand Garden Arena on November 19, 2015 in Las Vegas, Nevada. (Photo by Mindy Small/FilmMagic)
LAS VEGAS, NV - NOVEMBER 19: Actress Zoe Saldana (R) and artist Marco Perego attends the 16th Latin GRAMMY Awards at the MGM Grand Garden Arena on November 19, 2015 in Las Vegas, Nevada. (Photo by Christopher Polk/Getty Images for LARAS)
Actress Zoe Saldana (R) and Marco Perego arrive at a cocktail reception to celebrate the opening of the multimedia exhibtion 'Hollywood Costume,' October 1, 2014 at the historic Wilshire May Company Building, the future location of the Academy Museum of Motion Pictures, in Los Angeles, California. 'Hollywood Costume' runs from October 2 to March 2 and features over 100 famous cinematic costumes, including the original red ruby slippers worn by Judy Garland in The Wizard of Oz and Dorothy's blue and white gingham pinafore dress. AFP PHOTO / Robyn Beck (Photo credit should read ROBYN BECK/AFP/Getty Images)
Actress Zoe Saldana, right, and her husband Marco Perego attend the Academy of Motion Picture Arts and Sciences celebration for the opening of the "Hollywood Costume" exhibition at the Wilshire May Company building on Wednesday, Oct. 1, 2014 in Los Angeles. (Photo by Dan Steinberg/Invision/AP Images)
Marco Perego and Zoe Saldana attend LAXART at Greystone Mansion on Saturday, September 27, 2014 in Beverly Hills, California. (Photo by Todd Williamson/Invision/AP Images)
IMAGE DISTRIBUTED FOR PANTELION FILMS - Oscar Jaenada, left, and Zoe Saldana attend the after party for the premiere of Pantelion Film's 'Cantinflas' at the Roosevelt Hotel on Wednesday, August 27, 2014 in Los Angeles. (Photo by Todd Williamson/Invision for Pantelion Films/AP Images)
WEST HOLLYWOOD, CA - AUGUST 25: Marco Perego and Zoe Saldana Seen Shopping In West Hollywood, California on August 25, 2014. Credit: John Misa/MediaPunch/IPX
Zoe Saldana arrives at the 5th Annual Audi Emmy Celebration on Thursday, Aug. 21, 2014, in West Hollywood, Calif. (Photo by Richard Shotwell/Invision/AP)
WEST HOLLYWOOD, CA - AUGUST 14: Zoe Saldana and husband Marco Perego seen in West Hollywood, California on August 14, 2014. Credit: John Misa/MediaPunch/IPX
NEW YORK, NY - JULY 30: Zoe Saldana at Late Show with David Letterman promoting Guardians of the Galaxy on July 30, 2014 in New York City. Credit: RW/MediaPunch/IPX
Zoe Saldana attends a screening of "Guardians of the Galaxy" hosted by The Cinema Society and Men's Fitness on Tuesday, July 29, 2014 in New York. (Photo by Charles Sykes/Invision/AP)
Zoe Saldana arrives for the European Premiere of Guardians Of The Galaxy at a central London cinema, Thursday, July 24, 2014. (Photo by Jonathan Short/Invision/AP)
Zoe Saldana arrives at the premiere of "Guardians Of The Galaxy" at El Capitan Theatre on Monday, July 21, 2014, in Los Angeles. (Photo by John Shearer/Invision/AP)
EXCLUSIVE - Zoe Saldana, left, and Marco Perego are seen at Grades of Green Verte 2014 at MBS Media Campus on Friday, June 6, 2014, in Manhattan Beach, Calif. (Photo by John Shearer/Invision for MBS Media Campus/AP Images)
EXCLUSIVE - Marco Perego, left, and Zoe Saldana are seen at Grades of Green Verte 2014 at MBS Media Campus on Friday, June 6, 2014, in Manhattan Beach, Calif. (Photo by John Shearer/Invision for MBS Media Campus/AP Images)
Marco Perego and Zoe Saldana during a Relativity Media lunch at the 67th international film festival, Cannes, southern France, Sunday, May 18, 2014. (Photo by Joel Ryan/Invision/AP)
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