The trio performed their final show together on the 31-year-old star's Certified Platinum Tour in Tulsa, Oklahoma, reported Us magazine.
"I love raelynnofficial and gwensebastian! Inked in perfect harmony! Thank you Brookside Tattoo! #sisterink #TattoosInTulsa #certifiedplatinumtour," she captioned a black and white photo of the group showing off their new ink on Saturday, February 28.
Sharing a similar photo, RaeLynn said, "On your last show you get inked in perfect harmony."
Singers Sunny Sweeney and Justin Moore are set to replace RaeLynn and Sebastian when Lambert begins her tour again on March 6.