Lena Dunham Hasn't Dressed Up for Halloween in Years for One Very Good Reason

Lena Dunham gets all dressed up to launch her book “Not That Kind Of Girl” at the Southbank Centre’s Royal Festival Hall on Friday afternoon (October 31) in London, England.

The 28-year-old Girls star met up with author Caitlin Moran at the big event.

PHOTOS: Check out the latest pics of Lena Dunham

Lena spent her day working and traveling instead of celebrating Halloween and for good reason.

“Been years since I dressed up for Halloween (bc it’s been years since I thought of a costume that wasn’t going to hurt someone close to me),” she tweeted.

10+ pictures inside of Lena Dunham at her London book launch…