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ET confirms that Christina Applegate will openly discuss her fight against breast cancer this week for the first time since announcing she had been diagnosed with the disease. 

The 36-year-old "Samantha Who?" star will appear on ABC's Good Morning America on Tuesday to talk about her recent diagnosis.

A statement issued by Applegate's rep earlier this month when ET broke the news said the actress was diagnosed with an early form of breast cancer but the illness was caught early and is not considered life threatening. 

For more on Christina and the latest on "Samantha Who," click here!