On Tuesday, the "Vampire" singer marked the milestone birthday by taking to Instagram to share multiple celebratory snaps — including one showing her posing next to a "spill ur guts" cake.

So, of course, you have to announce it to the world with some super cute 21st birthday ... 21 and fun Serving cake and serving looks 21 wishes Chapter 21, page 1 Happy 21st birthday to me!

David and Victoria Beckham pulled out all the stops for their eldest son Brooklyn Beckham's 21st birthday this week, and took him out for a celebratory family meal in London on Wednesday.