Christina Aguilera celebrates fiance Matthew Rutler’s birthday with a stunning pregnancy throwback pic

Christina Aguilera celebrated her man's birthday in serious throwback style. 

The pop star took to her Instagram stories on Thursday to celebrate fiance Matthew Rutler's special day, sharing a gorgeous throwback photo from her 2014 pregnancy with daughter, Summer Rain.

The black-and-white image, adorned with pink hearts and arrows pointing to her baby bump, features Aguilera lying on her back in a sheer white v-neck dress while a shirtless Rutler leans in for a kiss. It was the same photo from her shoot with Vmagazine, one that also featured the 37-year-old singer naked with her bump on full display.

The former Voice coach also shared a touching shot of her and Rutler in a sweet embrace while he kisses her forehead.

"Birthday boy...," Aguilera wrote. "To a wonderful father, loving man and hardest worker I know."

Rutler appeared grateful for all the birthday love, sharing a clip to Instagram of a 3-year-old Summer gifting him with a box of sweet treats.

"For your birthday," the little girl adorably stated, as she shoved a box toward her dad.

"For more birthday?!" Rutler asked, incredulous. 

"Open it, Daddy!" she replied. 

Aguilera met Rutler on the set of Burlesque in 2010 and started dating shortly after her divorce from Jordan Bratman. Her and Bratman have a 10-year-old son, Max, together.

RELATED: Christina Aguilera and Matt Rutler together

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Christina Aguilera and Matt Rutler together
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Christina Aguilera and Matt Rutler together
LOS ANGELES, CA - JANUARY 16: Christina Aguilera and Matt Rutler arrives at the Stella McCartney's Autumn 2018 Collection Launch on January 16, 2018 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
WESTWOOD, CA - JULY 23: Christina Aguilera, Matthew Rutler, Max Liron Bratman and Summer Rain Rutler attend the premiere of 'The Emoji Movie' at Regency Village Theatre on July 23, 2017 in Westwood, California. (Photo by Jason LaVeris/FilmMagic)
MOUNTAIN VIEW, CA - NOVEMBER 09: Singer Christina Aguilera (R) and Matt Rutler attend the Breakthrough Prize Awards Ceremony Hosted By Seth MacFarlane at NASA Ames Research Center on November 9, 2014 in Mountain View, California. (Photo by Steve Jennings/Getty Images for Breakthrough Prize)
WESTWOOD, CA - JULY 23: Christina Aguilera, Matthew Rutler, Max Liron Bratman and Summer Rain Rutler attend the premiere of 'The Emoji Movie' at Regency Village Theatre on July 23, 2017 in Westwood, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - APRIL 18: Christina Aguilera and Matt Rutler are seen on April 18, 2014 in New York City. (Photo by David Krieger/Bauer-Griffin/GC Images)
NARITA, JAPAN - APRIL 02: (EXCLUSIVE ACCESS SPECIAL RATES APPLY) Singer Christina Aguilera, Max Liron Bratman and Matt Rutler are seen at Narita International Airport on April 2, 2013 in Narita, Japan. (Photo by Jun Sato/WireImage)
NEW YORK, NY - APRIL 17: Christina Aguilera and Matt Rutler are seen in Tribeca on April 17, 2014 in New York City. (Photo by Alo Ceballos/GC Images)
LOS ANGELES, CA - OCTOBER 28: Christina Aguilera and Matt Rutler are seen at Halloween Party on October 28, 2012 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - OCTOBER 25: Singer Christina Aguilera (L) and Matt Rutler attend the Samsung Galaxy Note II Beverly Hills Launch Party on October 25, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images for Samsung)
LOS ANGELES, CA - MARCH 29: Matt Rutler (L) and Christina Aguilera attend a basketball game between the Oklahoma City Thunder and the Los Angeles Lakers at Staples Center on March 29, 2012 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images)
LOS ANGELES, CA - NOVEMBER 08: Actress/singer Christina Aguilera and boyfriend Matt Rutler attend the 'The Elder Scrolls V: Skyrim' video game launch party at Belasco Theatre on November 8, 2011 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
LOS ANGELES, CA - OCTOBER 17: Christina Aguilera and Matt Rutler are seen at Off Vines restaurant on October 17, 2011 in Los Angeles, California. (Photo by JB Lacroix/WireImage)
NEW YORK, NY - MAY 16: Singer Christina Aguilera (R) and Matt Rutler enter the Hilton Hotel on May 16, 2011 in New York City. (Photo by Ray Tamarra/Getty Images)
NEW YORK, NY - MAY 16: Singer Christina Aguilera (R) and Matt Rutler enter the 'Late Show With David Letterman' taping at the Ed Sullivan Theater on May 16, 2011 in New York City. (Photo by Ray Tamarra/FilmMagic)
BEVERLY HILLS, CA - JANUARY 16: Matt Rutler and Christina Aguilera attend the InStyle and Warner Bros. 68th annual Golden Globe awards post-party at The Beverly Hilton hotel on January 16, 2011 in Beverly Hills, California. (Photo by John Shearer/Getty Images)
68th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: (l-r) Matt Rutler, Christina Aguilera arrive at the 68th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 16, 2011 (Photo by Evan Agostini/NBC/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - JANUARY 16: Singer/actress Christina Aguilera (R) and boyfriend Matt Rutler arrive at the 68th Annual Golden Globe Awards held at The Beverly Hilton hotel on January 16, 2011 in Beverly Hills, California. (Photo by Jason Merritt/Getty Images)
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