Just as the moon rises and falls in the night sky, so has Justin Bieber's butt risen and fallen on Instagram.
The pop star has deleted a -- what's the opposite of full-frontal? -- vacation shot of himself naked, booty prominently exposed, and offered up an apology.
Apparently, he's now thinking of the children.
"Hey I Deleted the photo of my butt on Instagram not because I thought it was bad but someone close to me's daughter follows me and she was embarrassed that she saw my butt and I totally wasn't thinking in that aspect," he wrote Saturday, captioning a shot of himself fully clothed.