“Happy anniversary baby!!” wrote McGraw, 52, this Sunday, October 6, alongside a photo of the two at the 1997 American Music Awards.
“23 years and I can’t wait for the next 50!!!” he added. “I love u.”
RadarOnline.com readers know the country stars tied the knot in 1996 and welcomed daughter Gracie one year later. They welcomed Maggie in 1998 and Audrey in 2001.
“To my one and only, Happy Anniversary, my love,” wrote Hill, 52, alongside a throwback photo of them together. “Love you ?❤️.”
She also replied to her husband’s Instagram post with three heart emojis.
Hours after the singers shared their tributes, McGraw posted another photo of him with Hill.
“Another pic for our anniversary......just for fun :)” he wrote.
“Tim and Faith have faced many challenges over the years, but they’ve managed to keep going,” a friend of McGraw told RadarOnline.com.
This September, the “It’s Your Love” singer was caught buying booze despite his commitment to sobriety.
“Tim has been clean and sober for 11 years, but he likes to throw a good party!” an insider revealed. “When he and Faith entertain, they have alcohol ready and available for guests.”
But the source said Hill still worries her husband could relapse.
“Faith is terrified of his temptation,” the insider added. “It nearly destroyed their marriage before!”
His past alcohol and drug use also led him to get aggressive with men, or flirty with women.
“He’d be so loaded he’d start flirting with women, or somebody would look at him the wrong way and he’d be ready to brawl,” the insider said.
Readers know that in 2007, Hill gave McGraw and ultimatum — her or drugs — and he eventually gave up his hard-partying lifestyle. In 2017, the two embarked on their "Soul2Soul: world tour, and sources have said they plan to renew their vows.