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The Open Book author paid tribute to her husband, 40, on their special day with a sweet Instagram post.
"Eric Johnson, my Husband, I love you. 6yrs ago today I married my perfect soulmate," she wrote. "Our unity was written in God's sky of colliding stars. Together we manifest dreams, nurture desire, and hold space. Destined, it always has been and always will be, forevermore."
Simpson also mentioned the special gift that the former NFL tight end presented her: a large geode crystal in the shape of a butterfly.
"Also, anyone who knows me at all knows that this crystal butterfly is my dream gift 🦋," she added.
The "With You" songstress then finished off the post with a quote from Emily Brontë's Wuthering Heights, writing, "Whatever our souls are made of, his and mine are the same."
Simpson and Johnson tied the knot in a lavish wedding celebration in 2014 at the San Ysidro Ranch in Montecito, California, and celebrated the 10-year anniversary of the day they met in May.
"I fell head over slippers in love with this perfect man 10 YEARS ago today!" Simpson wrote on Instagram earlier this year. "By chance he knocked on my dreamy cottage door (sigh), I let him in and never let him leave."
"He is mine, I am his … forever," she added.
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