Miranda Leigh Lambert was born November 10, 1983, to Rick and Bev (nee Hughes) Lambert in Longview, Texas, and was raised in Lindale, Texas. She was named after her great-grandmother, Lucy Miranda.She has one younger brother, Luke Lambert. She has English, Irish and Native American ancestry.

On April 4, 2011, during the taping of the Academy of Country Music's 'Girls' Night Out' television special in Las Vegas, Lambert debuted her new project, girl group Pistol Annies. The group consists of Lambert, Ashley Monroe, and Angaleena Presley. They released their single, "Hell on Heels," in May 2011, and released their debut album, Hell on Heels, on August 23, 2011, which debuted at No. 1 on Billboard's country chart. Sasha Frere-Jones of The New Yorker said the trio "is good enough to recall those transcendent moments of vocal harmony the Dixie Chicks used to hit every few months."  Lambert's fourth studio album, Four the Record, was released on November 1, 2011; her first album for RCA Nashville, after Sony Music Nashville announced a corporate restructuring. Four the Record produced five singles: "Baggage Claim", "Over You", "Fastest Girl in Town", "Mama's Broken Heart", and "All Kinds of Kinds". "Over You", which Lambert and Shelton co-wrote, reached number 1 in early 2012.  On February 8, 2012, Lambert made her acting debut on NBC's long-running legal drama, Law & Order: Special Victims Unit in an episode titled "Father's Shadow". Lambert later told CMT News she was a big fan of the show: "I never wanted to act. I still don't. I don't want to be an actress. I just wanted to be on that show mainly so I could be a groupie [for their autographs]."  Late in 2012, Lambert appeared on Shelton's Christmas album Cheers, It's Christmas, to which she contributed guest vocals on a version of "Jingle Bell Rock". The soundtrack was released on October 2, 2012. On October 23, 2012, Lambert and Dierks Bentley announced the co-headlined 33-show Locked & Reloaded Tour, beginning on January 17, 2013.  On May 7, 2013, A second Pistol Annies album, Annie Up, was released. This album produced the group's first country chart entry with "Hush Hush". The Pistol Annies are also one of many acts featured on Blake Shelton's 2013 single "Boys 'Round Here", which went to number 1 on Country Airplay. They had previously accompanied Shelton on a rendition of "Blue Christmas" on Cheers, It's Christmas.

What other appearances did she have?
On October 23, 2012, Lambert and Dierks Bentley announced the co-headlined 33-show Locked & Reloaded Tour, beginning on January 17, 2013.