(Cover) - EN Showbiz - Charlize Theron has vowed never to auction herself for charity again - as she felt like a "dumb blonde" the last time she did it.

The Hollywood star appeared on the Conan Show to talk about her encounter with a rich stranger in the name of charity. Charlize says the experience left much to be desired.

"Don't ever do it. It is the worst idea ever. It's one of things, I was like, yeah I am a dumb blonde. They trick you with the whole, 'Oh you know you can help so many people', and then you fall for it," she told host Conan O'Brien.

Charlize has recalled the nerve-wracking experience, and revealed she took friends along for moral support. The blonde beauty joked about the potential background of her "date".

"I went to dinner with a strange man. I made two of my girlfriends go and sit at the restaurant while I was there," she revealed. "The closer I got to this thing, I was like, 'This could actually turn out really bad', like rich people can be creeps too!

"I'd rather just give the money [to charity]. It was a scary thing. And [the guy] was weird!"

The 36-year-old star is currently promoting her movie Prometheus, and can also be seen alongside Kristen Stewart and Chris Hemsworth in Snow White and the Huntsman. (C) Cover Media