Clearly it was "Sunday Bunday" for Justin Bieber, who on Sunday Instagrammed a picture of his wee bottom posing in front of a majestic lake on a camping trip. It's very moving.

Dat ass doe @johnny photo cred

A post shared by Justin Bieber (@justinbieber) on

Seems like people are having a hard time keeping all their clothes on in their Instagrams lately, what with Kim K.'s nudie and spring's deluge of bikini pics.

In other Bieber news, rabid fans of him and his ex ("But are they getting back together?" You can hear the whispers growing. BUT ARE THEY?) Selena Gomez noticed on Thursday that the Biebs "liked" (or "hearted" or whatever the kids are calling it) a #throwback Instagram Selena posted of herself, sitting at a piano in a bikini.