"It's not just getting a second opinion from another doctor, which I also think is important, but in my case I got a second opinion on my pathology, because that pathology had come in that it was negative," she explained on the Today Show Monday. "And I just had that gut! And a girlfriend of mine who had had breast cancer twice suggested getting a pathology second opinion, and that's really the thing that made all the difference."
Now the actress and singer, 59, is living life to the fullest.
"I feel fantastic," Wilson said. "What could be better, I'm like living the life of a rock star. But I feel healthy, 100 percent, that's the most important thing."
Wilson announced to PEOPLE exclusively last March that she was diagnosed with invasive lobular carcinoma, and underwent a bilateral mastectomy and reconstruction. She proudly declared that she was cancer-free in December.
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"It's like you meet a complete stranger, fall madly in love, make musical intercourse and give birth to a magical song baby," she said. "You have to be completely exposed and you can't really go into a session and fake it, and so that's one of the things I find so rewarding about song writing."
She even wrote a song about her husband, Tom Hanks, who's hitting the road with her.
"He's just so happy, he's coming on part of the tour with me," Wilson said. "He's so supportive."