Miranda Lambert and husband Brendan McLoughlin celebrated their sixth wedding anniversary with a sweet post on Monday.

Miranda Lambert has had her share of heartbreak ... She sang an acoustic rendition of "Bluebird" from the iconic Bluebird Cafe in Nashville. Perhaps the duet was designed to put the "No Doubt ...

She continued on to share a story of visiting Lambert’s farm ... song and they [Luke and Miranda] were in the exact same spot where they wrote [the song] ‘Bluebird.’ As we were writing ...