Nick Lachey Shares Sweetest Sixth Anniversary Message for 'Beautiful' Wife and 'Soul Mate' Vanessa

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Nick and Vanessa Lachey are serious marriage goals.

The former 98 Degrees frontman paid tribute to his "beautiful" wife, Vanessa, on Saturday as the two celebrated their sixth wedding anniversary. Nick posted a gorgeous black-and-white photograph from the couple's 2011 tropical wedding, along with a heartfelt message and the #soulmate hashtag.

RELATED: Vanessa Lachey Lost Her Wedding Ring, So Husband Nick Searched Through the Trash to Find It!

"Six years ago today, I took this beautiful woman as my wife and the life we've built together is more incredible than anything I could have ever imagined!!" the 43-year-old singer wrote. "Through all of the laughter, tears, triumphs, and challenges, you are my unconditional rock. I love you and our family more than you will ever know. Thanks for your patience, support, and love. Thanks for being you. Happy Anniversary!!"

Vanessa, 36, then shared a sweet black-and-white snap of their three children -- Camden, 4, Brooklyn, 2, and Phoenix, 3 months.

"Happy Anniversary, Baby!" the former MTV VJ wrote, alongside a heart emoji. "I Love You and this Beautiful life we've made! You are my person! Forever and Ever."

MORE: Vanessa and Nick Lachey Spend Spring Break on the Beach With Their 3 Kids -- See the Family Photos

The couple dated for four years prior to getting engaged in November 2010, and their intimate July 2011 nuptials took place on a Caribbean island in front of a small gathering of 35 close friends and family.

When Vanessa recently lost her wedding ring, her devoted husband sifted through bags of trash to find it and documented his successful find on Instagram.

"This is true love after 6 years of marriage… digging through dirty diapers and trash to find your wife's missing wedding ring!! #success" Nick wrote.

For more on the happy family of five, watch the video below.