The 'Good 4 U' hitmaker celebrated her milestone birthday ... cake. The musician also posted a throwback snap of herself as a child wearing a handmade birthday hat. Olivia Rodrigo/Instagram "21!!!

By Hannah Dailey The Spicy Pisces is officially 21. And after celebrating her milestone birthday Tuesday (Feb. 20) with a huge birthday cake and a party with friends, Olivia Rodrigo shared her ...

Millie Bobby Brown rang in her 21st birthday ... and sand-covered cake. At the end of the video, Bobby Brown mouths the lyrics “except for the fact it was my birthday, my stupid birthday ...