The 30-year-old actress made the announcement on her new blog, ChemoCouture, saying she was diagnosed in September with the “Cadillac of tumors” — but is maintaining a positive outlook.

“On September 24, 2014, at age 30, I was diagnosed with stage 2B ductal carcinoma: in-situ and invasive. Fancy words for breast cancer,” the singer said.

“Now as far as cancer goes, I have the Cadillac of tumors. It’s slow growing, highly treatable and not really interested in spreading. My doctor calls it an ‘old lady cancer.’ I always knew I was ahead of my time! Picture a lump sitting in a BarcaLounger eating Cheetos and enjoying the warm, cozy studio apartment I’ve been providing for it on Left Breast Lane. No one would want to leave that, am I right? Well, sorry buddy. I’m the landlord from hell and it’s eviction time.”
 

After the diagnosis, the actress says she considered alternatives to chemotherapy, but ultimately decided to have the treatments.
 

“I begged, coaxed and flirted with every doctor I have in an attempt to avoid this,” she wrote. “There were vanity reasons, of course. I’m a Leo and we lions love our hair…

"I’ve always believed you feel better when you look better. And what better time to test that out than when I’m going to be feeling pretty terrible for while! ChemoCouture will be dedicated to all things fun and fashion, while being focused on the specific needs of those women going through chemo. My goal is to have us all feeling beautiful together, wherever you are in your life.”