Miranda Lambert Kicks Up Her Heels, Jokes and Sings Songs About Heartbreak at Nashville Fundraiser

updated 07/29/2015 AT 02:00 PM EDT

originally published 07/29/2015 AT 02:00 AM EDT



After 10 years together, country superstars Blake Shelton and Miranda Lambert are calling it quits. Subscribe now for an inside look into their shocking split, only in PEOPLE.

Wearing ripped blue jeans, a black sleeveless shirt and black cowboy boots, newly single Miranda Lambert joined a bunch of her country pals for a special acoustic performance in Nashville on Tuesday night.

The Grammy winner opened the sold-out Roadside Bars and Pink Guitars Unplugged show at the famed 3rd and Lindsley Bar and Grill with songs including "Dear Diamond" and interacted playfully with her friends onstage, including Clare Dunn, Courtney Cole, Natalie Hemby, Jessi Alexander, ex-husband Blake Shelton's Voice contestant RaeLynn and Little Big Town's Karen Fairchild.



"Had a great time last night pickin' & grinnin' with these gal pals! Thanks to everyone who came to 3rd & Lindsley to hang with us," Lambert, 31, captioned an Instagram photo Wednesday. "#musicismedicine #friends #galpals"



Lambert, who called it quits with Shelton just nine days ago, bantered with the crowd in the intimate setting, much to the delight of fans.

The concert, which sold out in minutes, was held to raise money for the Miranda Lambert Women Creators Fund, which will provide scholarship assistance to women studying at Belmont University's Mike Curb College of Entertainment and Music Business.



"The theme of this concert was very much women's empowerment," concertgoer Alexa Beyer told PEOPLE, adding that Lambert "looked so strong and together."

"That's the way to go through a breakup – she just bounced back," Beyer added.

Alexander played two songs by Lambert's ex, and Tia Scola, who was in the audience, tells PEOPLE that Lambert, "was just singing along and feeling it. She was funny. She was like, 'I've been living off caffeine and sad songs.' "

When Lambert brought out RaeLynn, who's touring with her, she asked her to perform "Love Triangle," a song written about her parents' divorce. The show closed with Little Big Town's "Girl Crush."

Late Wednesday morning, Lambert shared a second post-show photo of herself with a pal. "Thank you Jesus for girlfriends and coffee," she wrote. "Oh and concealer! #wewokeuplikethis"

Thank you Jesus for girlfriends and coffee. Oh and concealer! #wewokeuplikethis

A photo posted by Miranda Lambert (@mirandalambert) on



In the days following the country music supercouple's split the pair traded silly Tweets and Lambert snapped selfies on a giggly girls' night out.

Reporting by KATHERINE FOREMAN

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