For better, for worse, in sickness and in health.

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“Today marks 16 years with the love of a lifetime,” the British-American model, 46, captioned via Instagram Friday a photo of the couple sharing a sweet hug.

“We’ve shared monumental highs and devastating lows, and through it all, we’ve built something timeless.”

Heming added that she is “so deeply grateful” for “every chapter” she and Willis, 70, have shared.

She concluded that she is looking forward to “all the ones we’ll continue to write, in our language of unconditional love 💙posted photos of her wedding ring and “anniversary treats” via her Stories.

Heming’s reflective post comes nearly three years after Willis’ family announced he had been diagnosed with aphasia, a medical condition that affects a person’s ability to speak, write and understand language.

The following year, the “Die Hard” star’s condition worsened, as he was also diagnosed with frontotemporal dementia, which is a group of brain disorders that leads to changes in cognition, behavior, personality and language. Memory loss is also a symptom.

Heming — along with Willis’ ex-wife, Demi Moore, and all five of his daughters, said at the time that they wanted to bring “global attention and connectedness” to others suffering from the “debilitating disease.”

“Bruce has always found joy in life — and has helped everyone he knows to do the same. It has meant the world to see that sense of care echoed back to him and to all of us,” they added in February 2023.

A month later, Heming renewed her vows with Willis to keep their “memories safe.”

“Seize every opportunity to unite and celebrate with family and friends,” the actress, who first tied the knot with the “Armageddon” star in 2009, wrote via Instagram at the time.

“Those are the moments and beautiful pockets of memories that you get to hold on to for a lifetime. And we get to keep those memories safe and alive for the ones that might not be able to 💌.”

That November, Heming got candid about the “guilt” she struggles with amid her husband’s health battle.

“I struggle with guilt, knowing that I have resources that others don’t,” she wrote in an op-ed for Maria Shriver’s Sunday Paper at the time. “When I’m able to get out for a hike to clear my head, it’s not lost on me that not all care partners can do that.”

Earlier this month, Heming also shared how the deaths of Gene Hackman and his wife, Betsy Arakawa — who was also a caregiver — resonated with her.

“I do really believe that there is some learning in this story. It’s just made me think of this broader story, and that is that caregivers need care too and that they are vital,” she wrote in a post on Instagram.

“It is so important that we show up for them so that they can continue to show up for their person.”

Aside from helping take care of Willis, Heming also looks after their two daughters. The couple shares 12-year-old Mabel and 10-year-old Evelyn.