The 38-year-old entertainer took to social media to celebrate the amazing milestone.
Sharing to her 3.5 million followers, Pink posted an adorable collage of some of the couple's cutest pictures.
She captioned the collage, '12 years married today. 16 if ya count the 4 years we spent deciding if we were going to live together forever or kill each other. It’s been a nice mix of that ever since. 💖Get em’ young and train em’ ladies. I still have a crush on you @hartluck'
Carey also took to his social media to praise his wife of 12 years.
Posting a side-by-side image of The couple now and the couple twelve years ago, the 42-year-old motorcycle racer wrote: 'Today this beautiful woman and i celebrate 12 years being married. What a crazy ride baby!!!!
'Can’t say there is a single person on this planet I’d rather spend my time with than you. We have built an amazing family, and life together. Who would have thought two misfits like us could have done such a great job.'
He continued, 'I’m so proud of the person you are, and more so the mother and wife that you have become. Like you always say 'we live in dog years', so here is to another 84 years. I love you 😘 '
The couple met in 2001 at the X Games.
Pink then proposed to Hart in June 2005 during a motocross race. She was 'assisting' in his race and wrote 'Will You Marry Me? I'm serious!' on a pit board. Hart initially didn't notice and continued on for another lap. When he did notice later, he immediately veered off the track to accept then. Pink then made Hart finish the race because she 'wouldn't marry a loser.'
The couple wed in Costa Rica in 2006.
It was 2008 that the pair decided to separate, only to reunite in 2010.
The couple welcomed daughter Willow Sage in 2011 and son Jameson Moon in 2016.
Congratulations to the happy couple!