We broke the news to Justin that his ex had shaved her head (in a style very similar to the one that Justin's been rockin' for years, BTW) just hours after it happened to get his reaction. Justin was predictably tight-lipped on the subject, but a more recent Britney ex, JR Rotem had plenty to say! Last night at Area, he told us that he thought it was a "good look," then later, when his path crossed with Isaac Cohen's as they were waiting for their cars outside, he said he doesn't "know what she's doing right now!" Isaac, meanwhile, just looked shell-shocked!