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. "And I felt awful that she felt bad. To anyone I may have offended I'm so sorry. "
He apparently didn't mean anything by it a week ago when he posted the bare-backside shot.
"It was completely pure hearted as a joke but didn't take in account there are littles following me!!! Love u guys," he said.
Meanwhile, over on Chrissy Teigen's Instagram page, her hubby John Legend's butt remained unapologetically visible. Different audience, it seems.