Over the past few years, concert venues have become the new place to find fashion inspiration. Thanks to stars like Beyonce and Taylor Swift, it is no longer enough to buy a ticket and show up; the audience must also show it off. Olivia Rodrigo's Guts Tour is a prime example.

Thousands of fans in checkered skirts and platform boots flocked to see the "Get Him Back" singer perform. And one of those fans was fellow pop music diva Mariah Carey. She joined Rodrigo on one of his recent tours (probably Atlanta, judging by her "peace up! A-town down" shirt) with her children Monroe and Moroccan Cannon.

Making the most of their joint performance, the two had a backstage reunion that even their biggest fans would not have expected, and in style. Rodrigo paired the aforementioned graphic tank with a contrasting Victoria's Secret red bra and rhinestone-studded hot pants (underwear). She accessorized with a silver "GUTS" necklace and crystal star studded black tights. This concert look, like her other looks, was styled by sisters Chloe and Chenelle Delgadillo.

Carrie and her pals matched that energy and dressed glamorously for the occasion; the "Obsessed" singer wore a sequined runway piece from Louis Vuitton's 2018 Resort Cruise collection. She also styled a pair of sheer tights.

However, her daughter Monroe was dressed appropriately for the theme. She wore an off-the-shoulder concert t-shirt from Rodrigo's current merch collection. The shirt read "I OR UR GUTS" and had the singer's initials in the shape of a heart. Monroe paired it with a black miniskirt and star-spangled tights, as did Rodrigo.

Cannon called the concert "the best night of my life" on Instagram, adding: "@oliviarodrigo I love you so much."

There's still time to collaborate on "All I Want For Christmas."