"I haven't seen the new Ben Stiller movie 'Tropic Thunder' - and I won't go see the movie because of what I've heard -- but I want to add my two cents to the opinions on whether it's offensive to the mentally challenged," the former "Brady Bunch" star wrote on her blog on Fancast.

As previously reported on AccessHollywood.com, a host of disability advocate groups have been protesting the movie, at the premiere and in the media, over the use of the "R-word" in the film.

Click through for what Matthew, who has a cameo in the movie, had to say.

Last week's opening of "Pineapple Express" failed to unseat the latest installment in the Batman franchise, but "Tropic Thunder," another R-rated action-comedy, could do the trick, members of the star-studded cast told Access Hollywood.