The musician also posted a throwback snap of herself as a child wearing a handmade birthday hat. Olivia Rodrigo/Instagram ... Never miss a story — sign up for PEOPLE's free daily newsletter ...

What did matter was that the boots, punky symbols of past musical rebellions, were central to the unofficial-but-conspicuously-official uniform of Olivia Rodrigo ... a cowboy hat or attending ...

Olivia Rodrigo went playful and romantic for her 19th birthday, wearing a silky ... Rodrigo's vintage-inspired look also featured a cowboy hat that read "Birthday Girl," a silver necklace with ...