She apparently told the audience, "I wish I've been drinking all day. I deserve it: I just got divorced."
Multiple fans Tweeted the quote, with slight variation, late Friday, as Lambert took the stage for WE Fest in Detroit Lakes.
"I wish I've been drinking all day, I deserve it i just got divorced" -@mirandalambert I'll drink with you babe all day everyday— Charity (@charitybxo) August 8, 2015
"I wish I would have been drinking all day, i deserve it, I got a divorce!" - Miranda Lambert— Kyle Nixon (@knixon1996) August 8, 2015
The country star, 31, and her husband of four years, fellow country star Blake Shelton, announced their divorce late last month.
"This is not the future we envisioned. And it is with heavy hearts that we move forward separately," the couple said in a statement.
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But neither has gone totally silent: Lambert and Shelton, 39, soon traded a few playful Tweets following the announcement.
And Lambert has been spotted out more than once with her girlfriends – including cheering on Shania Twain in Nashville, Tennessee.
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