Kangana Ranaut is set to play the legendary Madhubala in a film titled “Once Upon A Time”, but she says looking as beautiful as the late actress is a challenge.

“I’ve never thought of myself as beautiful. In fact, I’ve always suffered from low self-esteem. Till recently I’d look at my pictures and cringe. I still have the pictures from my first portfolio I got done in Chandigarh. They remind me of how ugly I can look. And to now play Madhubala in &#