After two lethargic performances at the 2011 Billboard Awards sparked debate among her own fans as to whether she should stop performing, footage of Britney “singing” a Femme Fatale album track on an American talk show has finally been telelvised.

The 29-year-old pop star performed Big Fat Bass on the Jimmy Kimmel show in March, but it was only aired last night.

We all know that she doesn’t sing live – but how can someone forget how to lip-sync?

Watch Britney phone it in on Jimmy Kimmel below.

Via Idolator.

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