Julia Louis-Dreyfus

Veep star Julia Louis-Dreyfus reveals breast cancer

"1 in 8 women get breast cancer," she wrote. "Today I'm the one."

She said the "good news" was that she had a "glorious group" of family and friends supporting her and "fantastic" insurance through her union.

The 56-year-old has also featured on Saturday Night LiveThe New Adventures of Old Christine and played Elaine Benes on Seinfeld.

Earlier this month, Louis-Dreyfus picked up a record-breaking sixth Emmy Award for Outstanding Lead Actress in a row for her role in HBO series Veep.