Selena Gomez 'Come and Get It', Justin!

4/14/2013 6:37 PM PDT

Selena Gomez -- 'Come and Get It,' Justin Bieber!

Just in case you needed further proof why Justin Bieber is a fool ... here's Selena Gomez at the MTV Movie Awards.

Her new song is called "Come and Get It."

Don't worry, she's 20.