Brat summer has officially been extended into fall, thanks to Charli XCX and Troye Sivan’s star-studded Sweat Tour – and Sasha and Malia Obama are leaning in. The sisters, who

September, Charli XCX and Troye Sivan's Sweat Tour has enjoyed a star-studded audience, with everyone from Chloë Sevigny to Blackpink's Jennie supporting the musical duo from the stands. During their most recent stop at Los Angeles's Kia Forum,

Sasha Obama just wants to go back, back to 1999! The former First Daughter attended Charli XCX and Troye Sivan's Sweat tour in a throwback-inspired outfit that would have been right at home in the late '90s and early 2000s, complete with one of the most popular accessories of that time: the chunky belt.

Sasha wore a vintage Jean Paul Gaultier Jesus graphic long-sleeve tee and a pair of True Religion jeans, styled with an oversized belt sitting on her hips. The youngest Obama tucked her True Religions into a pair of black kitten-heel boots with a pointy toe and carried a red croc-embossed purse over her shoulder.