You just never know what Lauren Alaina is going to look like from one day to another. The rising country singer sports an '80s-inspired retro look in a new photo she posted to social media to wish tour mate Luke Bryan a happy birthday.

Bryan turned 41 on Monday (July 17), and Alaina marked the occasion with a group Instagram photo of the acts out on the road with Bryan on his Huntin', Fishin' and Lovin' Every Day Tour, which has been sweeping across the U.S. this summer. Alaina posed with Adam Craig, Bryan and Brett Eldredge wearing a Kiss T-shirt and tight glitter pants that could have been straight out of a Whitesnake video circa 1986, with her hair pulled up and back.

"Happy birthday @lukebryan!! Thank you times a million for letting me come out with y'all this summer," she captioned the photo. "As sad as I am that my run with you guys is over, I'm even happier that I got to be a part of it. #HFETour."

It looks like Alaina's dramatic pink hair that she revealed on July 10 must have been a temporary thing -- perhaps a look she will sport in the video for her new single, "Doin' Fine," whose cover shows her seated on a pink couch. The song is the second single from her Road Less Traveled album following the No. 1 success of its title song and first single.

Unlike Alaina's hair, her fondness for '80s metal appears to be a constant; in her previous photo, she sported a Poison T-shirt.

Lauren Alaina + More Dramatic Country Hair Makeovers

Country Stars Are Just as Beautiful Without Makeup