Taylor Momsen is picking up right where she left off in Whoville 25 years ago! A quarter of a century after starring alongside Jim Carrey in How the Grinch Stole Christmas, Taylor is slipping back into her original wardrobe! On Monday, the now-32-year-old took to Instagram to share unbelievable footage of herself attempting to fit into the costume she wore as Cindy Lou Who for the film when she was 7! And she was SUCCESSFUL! Related: Reese Witherspoon & Daughter Ava Phillippe Share New Christmas Photo - LOOK! In the video, Taylor is wearing the iconic frilly white skirt which goes under the pl...