FemaleFirst reported that during the Save the Children event at Lincoln Center in New York, the actress was wearing a dress that was hardly appropriate.
Many important guests were present at the event last Tuesday, including President George Bush.
A witness declared, "Mischa was wearing a sparkly yellow dress and one of her nipples was blatantly showing! It was so not appropriate for Save the Children."
The spokeperson for the 21-year-old denied the incident stating, "It didn’t happen, because if it did, there would be a photo."