Well, we guess this means those pictures were real!
We're talking full frontal. Full. Frontal.
[Image via Justin Bieber/Instagram.]
Selena told the crowd:
"One of my inspirations is Katy Perry. She’s been really wonderful and just really good as a person to me I think, she’s given me like two songs of hers and she’s been great so in honor of Katy we wanted to do this song for her."
Aw, so sweet!
Watch her cover above!