On Thursday, she and her boyfriend, Chicago Fire star Taylor Kinney, attended the Garth Brooks kickoff concert for his world tour outside of the city.
And this time, the blonde singer let her beau take over on the vocals. "He's singing 'I Got Friends in Low Places.' At the Garth Brooks show with my country boy. So much fun we're screamin!" she posted along with a photo on her Instagram page.
The duo wasn't the only celeb couple checking out Garth's show, which also included a short set by wife Trisha Yearwood.
Also enjoying the country tunes were Guardians of the Galaxy star Chris Pratt and his wife, Anna Faris.
"I'm at Garth Brooks right now. One of the greatest moments in my life. #GodBlessGarthBrooks," Pratt Tweeted, followed by, "New last verse to Thunder Rolls and this place is about to EXPLOOODE! Get ready. #GoSeeGarth!!!"
Singer Kelly Clarkson also turned out for Friday's show, bringing along 3-month-old daughter River Rose, decked out in bejeweled headphones. Clarkson joined Brooks's wife on stage for a duet of Yearwood's new tune, "PrizeFighter."
Gaga's busy weekend continued on Saturday, when she and Kinney ate dinner at Sunda restaurant in Chicago. This time her hair was very dark and pulled up into a ponytail, and she was wearing a one-shouldered black dress, an onlooker tells PEOPLE.
Gaga walked in through the front door, along with security, smiling and holding Kinney's hand as they strolled through the dining room to a private space in the back. She stopped to take a photo with fans at one table and "they seemed to enjoy a low-key night," a source says.
I'm at Garth Brooks right now. One of the greatest moments in my life. #GodBlessGarthBrooks— chris pratt (@prattprattpratt) September 5, 2014
New last verse to Thunder Rolls and this place is about to EXPLOOODE! Get ready. #GoSeeGarth!!!— chris pratt (@prattprattpratt) September 5, 2014