Actors who are committed to their craft will go to great lengths to ensure that they're portraying their character as realistically as possible. In some case, that means wearing a merkin. A merkin, for those of you who don't know, is a pubic wig. It's donned by actors and actresses who need their down-there hair to fit the time period of the film they're in. And considering most actresses likely engage in some sort of pubic grooming, a merkin ensures they can play the part realistically without having to grow their own pubes out accordingly. Additionally, a merkin can work as a sort of shield for the actor's own sexy bits, if they're not comfortable showing them off. Evan Rachel Wood had her first experience with going full-frontal on film when she was making the upcoming HBO movie, "Mildred Pierce." alongside merkin expert Kate Winslet. "I was a lot more nervous than I thought I was going to be," she said. "I looked at Kate and she was like, ‘You’ve got to do it. Trust me, it’s so brave. Put a merkin on and you’ll be fine.' ... Let’s just say, I had to wear a wig because it was in the '30s, and everything had to look like it was in the '30s." In other words, expect bush -- lots of bush -- when the film debuts March 27. [XfinityTV.com] The merkin has become a popular prop in many mainstream movies. Here's a look back at other famous moments in pubic-wiggery.