PIC: Lena Dunham Chops Off Her Hair!

Credit: Instagram

Dunham's got a new 'do!

On Saturday afternoon, Girls star Lena Dunham debuted an adorable, cropped haircut on Twitter.

"I Miley'd the sh-- out of this Saturday," she wrote, referencing the "Can't Be Tamed" singer, who chopped off her own long locks mid-August.

In addition to her bold new look, Dunham's also got a brand new beau. As Us Weekly first reported last week, the Tiny Furniture actress, 26, is currently dating fun.'s Jack Antonoff.

"They're trying to keep it a secret," explains a pal close to the star. Their jam-packed schedules can make it difficult to squeeze in quality time, but, a source says, "They have a good time when they can get together!"