Ariana Grande dazzled at the 2013 American Music Awards with a performance of 'Tattooed Heart.'

Wearing a sparkly red gown a la Jessica Rabbit, Grande clutched her mic in front of well-suited gentlemen backup singers. The 'Sam & Cat' starlet delivered a lounge-style rendition of the song, putting every other vocalist of the evening (up to this point) to shame.

Even Lady Gaga gave her a standing ovation! A few other artists got the same treatment ... but Grande is the one who deserved it the most. Bow!