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Brooke Mueller

Angela Weiss/Getty Images

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."