Britney Spears hair london hotel smoking sweats cigarette Britney Spears hair london hotel smoking sweats cigarette

Not sure why our girl Britney Spears looks so worried while chain smoking at the London Hotel in West Hollywood. Maybe it's because she just announced she'll be performing live on Good Morning America March 29 to promote her new album Femme Fatale.

The pop star revealed the news this morning during a 24 second clip. In a deep voice, Brit says:

    "Good morning, America. I'm excited to tell you on Tuesday morning, March 29, I'll be performing for the first time ever in a special concert in San Francisco's historic Castro district on 'Good Morning America.' And I promise you it'll be a morning to remember. See you soon!"


Now about that smoking habit ... should we hold it against her?

Britney's single has busted all kinds of records ... including one for most downloads in a single week. Find out how many after the jump.