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Christina Aguilera

Laura Farr/ZUMAPress.com

Christina Applegate has great news.

"They got everything out so I'm definitely not going to die from breast cancer," the Samantha Who? star says in an interview scheduled to air Tuesday on Good Morning America.

The 36-year-old actress, whose mom also battled—and survived—the disease, revealed earlier this month that she had been diagnosed with early-stage breast cancer and was undergoing treatment.

Applegate, said that she has been getting regular mammograms since she turned 30. A second MRI, part of the follow-up from a biopsy she had last year, revealed the cancer.

"I was so mad and I—I just remember I was—I was just shaking," she told GMA cohost Robin Roberts, herself a breast-cancer survivor, on Monday. "And then also immediately, I had to go into…'take-care-of-business-mode,' which was…I asked them, 'What do I do now? What—what is it that I do? I get a doctor, I get a surgeon, I get an oncologist? What do I do?'"

Apparently she did what was right for her, which included penciling in all the help she needed and switching to a macrobiotic diet

"I'm clear," Applegate said. "Absolutely 100 percent clear and clean. It did not spread. They got everything out so I'm definitely not going to die from breast cancer."

The poster-girl for preventive care, who found out in July that she had been nominated for her first lead-actress Emmy, is slated to appear alongside Charlize Theron, Meryl Streep and Jennifer Aniston on the one-hour special Stand Up to Cancer, which airs Sept. 5 on NBC, ABC and CBS.