Sarah Michelle Gellar and "Jersey Shore" alum Snooki.

Roughly 99 percent of the fun of watching a Lifetime music biopic is reading the Twitter reactions. They can be brutal, but also hilarious, and occasionally insightful. Sarah Michelle Gellar -- a '90s princess herself -- saved the entire experience with her running commentary during Saturday night's premiere:

Love it. Nicole "Snooki" Polizzi -- who knows from guilty pleasure TV -- shared her own thoughts on the docudrama:

We may never know Britney's thoughts. She and Justin Timberlake have yet to react, and they may decide to keep a permanent distance. Or we could discover, a long time from now, that they both watched every minute.

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