See How Selena Gomez Celebrated Her 21st Birthday
And while she had to share her big day with a certain royal baby's arrival, it looks like she still got plenty of birthday love.
The "Come & Get It" singer headed to Bagatelle in Los Angeles to celebrate on Monday, surrounded by gal pals like her Spring Breakers co-star, Ashley Benson. She seemed to be enjoying herself while hanging with her friends and goofing around, dressed casually in white shorts and an embellished shirt.
Selena also rang in the day by releasing a fun music video for her pop party track, "Birthday." She got the party started early on Sunday night, hitting the town (in devil horns) with her buddy, Lily Collins.