Pink's husband Carey Hart has paid a touching tribute to the pop star online as they celebrate their 10th wedding anniversary.

The singer wed motocross racer Carey on 7 January, 2006, and after a period of separation in 2008, the couple was able to reunite and rekindle its relationship.

Pink gave birth to their daughter, Willow, in 2011 and they have played happy families ever since.

They marked 10 years as husband and wife on Thursday (07Jan16), and Carey took to Instagram.com to share a sweet love note to his longtime partner.

"Happy anniversary to my MUCH better half," he writes alongside a black-and-white photo of the family. "10 years is a pretty amazing milestone for 2 misfits like us. I'm proud of us baby!!!"

"Thank you for being an amazing wife, mother, and friend," Carey continued. "I love you."

Pink and Carey's romance has had its fair share of ups and downs over the years. They began dating in 2001 after meeting at the X Games in Philadelphia, Pennsylvania, only to split in 2003. They were back together months later and the pop star was the one to propose to Carey while he competed in a motocross race at Mammoth Lakes in California in 2005 - she held up a sign as he whizzed past asking him to marry her.

They wed in Costa Rica in 2006, but shocked fans two years later (08), when they announced another break-up.

However, they remained close and Carey even featured in the video for Pink's 2008 break-up anthem So What, which was inspired by their own love split.

Pink, real name Alecia Moore, previously credited marriage counselling sessions and the arrival of their daughter with saving their relationship.

"Having a baby has made it permanent, you know?," she told Britain's Fabulous magazine in 2012. "I think marriages are so easy to get in and out of these days, I don't know if we're ever quite sure about forever any more. There's always that fear: 'Is this gonna (sic) work?' And then you have a child and in some ways it has to work. So you fight, but you fight... nicer."