March 30, 2017 at 05:19 PM EDT

Mandy Moore set the scene for fans in a big way this #ThrowBackThursday, sharing a sweet and nostalgic pic of herself at age 15 alongside an 18-year-old Justin Timberlake before she opened on tour for *NSYNC… at the end of the last century.

“Summer of 1999,” she wrote in the caption. “Abercrombie tshirts and bucket hats. Opening for this guy and his band.” Moore claims to have a nervous smile here, but we are still hung up on just how boyish the former boy band member looks. He sure has grown up, while the This is Us actress doesn’t seem to have changed much at all.

Fellow newcomer (and former girlfriend of JT) Britney Spears also opened for *NSYNC that summer. My, how our celebrities have grown!




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