Carrie Underwood and her husband Mike Fisher gush over each other on sixth wedding anniversary!

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Carrie Underwood Flaunts Her Toned Abs in a Hot Pink Bikini While Vacationing in Mexico

Six years and still madly in love! Carrie Underwood and her hockey player hubby, Mike Fisher, are just as obsessed with one another as when they first met. The pair took to Instagram on Sunday to each respectively commemorate their wedding anniversary.

WATCH: Carrie Underwood Strips Down to Teeny Bikini During Cabo Vacation With Husband Mike Fisher

Fisher posted a rare throwback pic from their big day, writing, "6 years ago today we were married. Time sure does fly when you're having fun and you marry up. I'm very grateful to have an amazing wife and mother by my side!!"

The "Church Bells" singer also shared a photo of her own, which appears to have been taken on the couple's recent romantic getaway to Cabo San Lucas, Mexico.

"Six years ago today, I said 'I do,' to this handsome fella. I meant it then and I mean it now," the American Idol alum wrote. "God put us together and continues to bless our marriage. I couldn't imagine this life without you, @mfisher1212 I am thankful for these past six years together (and, of course, for our beautiful son, Isaiah) and I look forward to spending the rest of our lives in love."

MORE: Country's Cutest Couples Cozy Up on the CMT Awards Red Carpet

The couple shares son Isaiah, 16 months, and have been together since 2008.

Just last week the proud parents were spotted sunning themselves on the Mexican vacation. Underwood flashed her toned abs in a pink bikini while her athlete husband showed off his own six pack in green board shorts.

RELATED: Carrie Underwood through the years

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NASHVILLE, TN - JUNE 13: Singer-songwriter Carrie Underwood attends a pre-show press conference during day 3 at the 2015 CMA Festival on June 13, 2015 in Nashville, Tennessee. (Photo by Terry Wyatt/Getty Images)
NASHVILLE, TN - JUNE 13: Singer Carrie Underwood performs at LP Field during the 2015 CMA Festival on June 13, 2015 in Nashville, Tennessee. (Photo by C Flanigan/FilmMagic)
NASHVILLE, TN - NOVEMBER 05: Carrie Underwood attends the 48th annual CMA Awards at the Bridgestone Arena on November 5, 2014 in Nashville, Tennessee. (Photo by Michael Loccisano/WireImage)
NEW YORK, NY - DECEMBER 10: Carrie Underwood and DICK'S Sporting Goods launch CALIA by Carrie Underwood, a fitness and lifestyle apparel brand at an event on December 10, 2014 hosted by Alicia Quarles in New York City. (Photo by Ilya S. Savenok/Getty Images for CALIA by Carrie Underwood)
NASHVILLE, TN - NOVEMBER 05: Carrie Underwood attends the 48th annual CMA Awards at the Bridgestone Arena on November 5, 2014 in Nashville, Tennessee. (Photo by Larry Busacca/Getty Images)
NASHVILLE, TN - JUNE 04: Carrie Underwood speaks during the 2014 CMT Music awards at the Bridgestone Arena on June 4, 2014 in Nashville, Tennessee. (Photo by Jeff Kravitz/FilmMagic)
NEW YORK, NY - DECEMBER 10: Carrie Underwood and DICK'S Sporting Goods' Alycia Scott unveil CALIA by Carrie Underwood. (Photo by Ilya S. Savenok/Getty Images for CALIA by Carrie Underwood)
PROVO, UT - JULY 04: Carrie Underwood Carrie Underwood performs in concert at LaVell Edwards Stadium on July 4, 2014 in Provo, Utah. (Photo by Clayton Chase/Getty Images)
NEW YORK, NY - DECEMBER 10: Carrie Underwood and DICK'S Sporting Goods launch CALIA by Carrie Underwood, a fitness and lifestyle apparel brand at an event on December 10, 2014 hosted by Alicia Quarles in New York City. (Photo by Ilya S. Savenok/Getty Images for CALIA by Carrie Underwood)
Brad Paisley may have announced it to the world, but Carrie Underwood found out her baby's gender in a much more private setting….and it wasn't a doctors office.
NEW YORK, NY - APRIL 29: Honoree Carrie Underwood (L) and husband Mike Fisher attend the TIME 100 Gala, TIME's 100 most influential people in the world, at Jazz at Lincoln Center on April 29, 2014 in New York City. (Photo by Ben Gabbe/Getty Images for TIME)
NASHVILLE, TN - NOVEMBER 05: Hosts Brad Paisley and Carrie Underwood speak onstage during the 48th annual CMA awards at the Bridgestone Arena on November 5, 2014 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
NASHVILLE, TN - NOVEMBER 05: Brad Paisley, Steven Tyler, and Carrie Underwood perform during the 48th annual CMA awards at the Bridgestone Arena on November 5, 2014 in Nashville, Tennessee. (Photo by Terry Wyatt/FilmMagic)
NASHVILLE, TN - NOVEMBER 05: Hosts Brad Paisley and Carrie Underwood speak onstage during the 48th annual CMA Awards at the Bridgestone Arena on November 5, 2014 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images)
NEW YORK, NY - JUNE 10: Singer Carrie Underwood attends the Samsung Hope For Children Gala 2014 on June 10, 2014 in New York City. (Photo by Neilson Barnard/Getty Images for Samsung)
NEW YORK, NY - JUNE 10: Singer Carrie Underwood attends the Samsung Hope For Children Gala 2014 on June 10, 2014 in New York City. (Photo by Neilson Barnard/Getty Images for Samsung)
NASHVILLE, TN - JUNE 04: Carrie Underwood and Miranda Lambert perform during the 2014 CMT Music awards at the Bridgestone Arena on June 4, 2014 in Nashville, Tennessee. (Photo by Jeff Kravitz/FilmMagic)
NASHVILLE, TN - JUNE 04: Carrie Underwood (L) and Miranda Lambert attend the 2014 CMT Music awards at the Bridgestone Arena on June 4, 2014 in Nashville, Tennessee. (Photo by Larry Busacca/WireImage)
NASHVILLE, TN - JUNE 04: Carrie Underwood and Miranda Lambert attend the 2014 CMT Music awards at the Bridgestone Arena on June 4, 2014 in Nashville, Tennessee. (Photo by Terry Wyatt/FilmMagic)
LAS VEGAS, NV - MAY 18: Singer Carrie Underwood arrives at the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Axelle/Bauer-Griffin/FilmMagic)
LAS VEGAS, NV - MAY 18: Singer Carrie Underwood arrives at the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Axelle/Bauer-Griffin/FilmMagic)
NASHVILLE, TN - JUNE 03: Carrie Underwood performs at The Grand Ole Opry on June 3, 2014 in Nashville, Tennessee. (Photo by Terry Wyatt/Getty Images for Schmidt Relations)
NASHVILLE, TN - JUNE 03: Carrie Underwood performs at The Grand Ole Opry on June 3, 2014 in Nashville, Tennessee. (Photo by Terry Wyatt/Getty Images for Schmidt Relations)
LAS VEGAS, NV - MAY 18: Recording artists Miranda Lambert (L) and Carrie Underwood perform during the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LAS VEGAS, CA- MAY 18: Singer Carrie Underwood, winner of the Milestone Award, poses in the press room at the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada.(Photo by Jeffrey Mayer/WireImage)
LAS VEGAS, NV - MAY 18: Singers Carrie Underwood and Miranda Lambert arrive at the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Gregg DeGuire/WireImage)
NASHVILLE, TN - SEPTEMBER 09: Mike Fisher and Carrie Underwood attend the 8th Annual ACM Honors at Ryman Auditorium on September 9, 2014 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images for ACM)
LAS VEGAS, NV - MAY 18: (EXCLUSIVE COVERAGE) Singer Carrie Underwood (R) and hockey player Mike Fisher attend the 2014 Billboard Music Awards at the MGM Grand Garden Arena on May 18, 2014 in Las Vegas, Nevada. (Photo by Kevin Mazur/Billboard Awards 2014/WireImage)
NASHVILLE, TN - DECEMBER 07: Carrie Underwood performs during The Raging Idiots' Million Dollar Show for St. Jude at Ryman Auditorium on December 7, 2015 in Nashville, Tennessee. (Photo by John Shearer/Getty Images for The Raging Idiots)
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