Which Charlie Sheen Ex Is Having a Halloween Eve Wardrobe Malfunction?

Trick or treat? Troubled former flame boobs at children's charity event

Brooke Mueller may not be dressing up for Halloween this year, but there is one piece of clothing she should wear while trick-or-treating tonight with 2-year-old twins Bob and Max.

A bra!

Mueller showed up to a children's charity event over the weekend where she not only shared her Halloween plans with ex Charlie Sheen, she also flashed a whole lotta nipple...

Mueller hit the 18th Annual Dream Halloween event benefiting the Children Affected by AIDS Foundation in Santa Monica on Saturday in a very see-through top that left little to the imagination.

"I don't dress up," Mueller told us, seemingly unaware of her skin-baring shirt.

As for going door to door with Sheen and their little ones, she dished, "Yes, we will be trick-or-treating together."

However, there may be more Charlies out there than she can handle.

"Do you know that there's a Charlie Sheen costume now and it's supposedly going to be bought out more than any other costume?" Mueller laughed. "So I'm going to have to see a hundred thousand of them! And it's going to be crazy."

Joking aside, she added, "I'm very proud of him. He's doing really great and we're really close friends."