Shawn Mendes singing 'Stitches' on 'Ellen' is the cutest thing you'll see all day

Get ready to #tbt to your teenage years when JTT, BSB and other Tiger Beat heartthrobs lined your walls.

Sweet as can be Shawn Mendes performed Stitches from his album Handwritten on Ellen Wednesday. And just like this girl, his performance has us tripping over ourselves.

FJJDSBJFNCBWJSNDNKENFI! Our thoughts exactly.

At just 16, the Canadian crooner, who got his start on Vine, has reached the top of the Billboard 200 and is slated to tour with Taylor Swift for 1989.

No wonder this girl is having this reaction.