Carrie Underwood and Mike Fisher celebrate their 11th wedding anniversary

Carrie Underwood and Mike Fisher celebrated their 11th wedding anniversary with mutually limp Instagram posts.

The Grammy winner posted a photo of a laid-back couple over the weekend while paying tribute to their decade-old “baby”.

“Happy birthday baby!” she captioned the snapshot. “11 years have certainly passed… here are many, many more! I love you!”

The former NHL player, meanwhile, shared a photo of the couple – who are now parents to two children, Isaiah, 6, and Jacob, 2 – beaming at their wedding on July 10, 2010.

“Happy Birthday @carrieunderwood, hard to believe it was 11 years ago today!” wrote Fisher, who played for the Ottawa Senators and Nashville Predators during his hockey career. “Here are many more with the best partner I can imagine !! #happy Birthday.”

Greetings from famous friends and celebrities poured in to mark the occasion.

“Happy birthday to you both !!!!” commented Elisabeth Hasselbeck.

“Aww, I love you all! Happy birthday friends, ”wrote musician Zach Swon.

Underwood, 38, and Fisher, 41, may be talking publicly about their love lives now, but it hasn’t always been so.

The couple kept the details of their 2010 wedding so low key that even their guests didn’t know the location ahead of time.

At the time, sources told Page Six that guests were cryptically ordered to arrive at an airport in a southern city before being whisked to the wedding venue by private jet or limousine.

“Carrie wants to keep the wedding small and secret,” a source told us before the big day.

The location ended up being the posh Ritz-Carlton Reynolds, Lake Oconee, Georgia. The winner of “American Idol” told People in 2010 that the 250-guest wedding “had exceeded my expectations” and was “a big party”.