Britney Spears reportedly threatened to walk-out on her altered comeback performance of ‘Gimme More’ after overhearing comedian Sarah Silverman rehearsing her monologue in which she called Britney’s sons, Sean Preston and Jayden James, ‘cute mistakes.’ (Watch The Footage Here)

According to X17Online: Needless to say, Britney was PISSED! … as any mom would be. Britney was so upset she walked through her performance just to get it over with (despite encouragement from her friends, including Sam who was apparently yelling at Sarah backstage) to skip out on it all together). She held up her end of the bargain and got a major slap in the face from Sarah.

Britney is rumored to have ordered MTV to prevent the acid-tongued comic from talking about her kids, and MTV agreed. Sarah performed her act as rehearsed.

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