1. Taylor Momsen as Cindy Lou Who in How the Grinch Stole Christmas: Universal, taylormomsen / Via instagram.com Fun fact: Momsen is now in an American rock band called The Pretty Reckless. 2. Eric Lloyd as Charlie in The Santa Clause: Disney, Eric Lloyd / Via reddit.com Fun fact: As a kiddo, Eric Lloyd still believed in Santa. He thought they were making a biopic. 3. David Krumholtz as Bernard in The Santa Clause: Disney, Nicholas Hunt / Getty Images Fun fact: Krumholtz has been in several TV shows since The Santa Clause including Numb3rs, The Deuce, and The Good Wife. 4. Daniel Tay as Michael in Elf: New Line Cinema, Kevin Kane Fun fact: The football jersey Michael wears is that of Wayne Chrebet, former wide receiver for the New York Jets. 5. Peter Billingsley as Ralphie in A Christmas Story: MGM, Jamie Mccarthy / Getty Images Fun fact: Peter made a cameo in Elf as Ming Ming, the head elf at the North Pole. 6. Thomas Brodie-Sangster as Sam in Love Actually: Universal Pictures, Tim P. Whitby / Getty Images Fun fact: Brodie-Sangster and his crush in the movie Olivia Olson reunited as love interests when Brodie-Sangster voiced Ferb in Phineas and Ferb, and Olson voiced his love interest, Vanessa Doofenschmirtz. 7. Olivia Olson as Joanna in Love Actually: Universal Pictures, Jerod Harris / Getty Images Fun fact: Olivia Olson's version of "All I Want For Christmas Is You" was so flawless that sound editors cut in breaths so it didn't sound manufactured. 8. Macaulay Culkin as Kevin McCallister in Home Alone: Warner Bros., Emma Mcintyre / Getty Images Fun fact: Director Chris Columbus auditioned 200 kids before he casted Culkin as Kevin. 9. Johnny Galecki as Rusty in National Lampoon's Christmas Vacation: Warner Bros., Frazer Harrison / Getty Images Fun fact: Only two Christmas movies came out in 1989 and Johnny Galecki was in both of them (Prancer and Christmas Vacation). 10. Juliette Lewis as Audrey in National Lampoon's Christmas Vacation: Warner Bros., Neilson Barnard / Getty Images Fun fact: Juliette Lewis reunited with her Christmas Vacation parents for a series of Old Navy commercials in 2012. 11. Ellen Latzen as Ruby Sue in National Lampoon's Christmas Vacation: Warner Bros., ellenlatzen / Via Twitter: @ellenlatzen Fun fact: Ruby Sue is wearing a wig in the film. Latzen had a mullet underneath it. 12. Miffy Englefield as Sophie in The Holiday: Columbia Pictures, miffyenglefield / Via instagram.com Fun fact: Jude Law's favorite part of the film was working with the two girls who played his daughters. 13. Karolyn Grimes as Zuzu Bailey in It's A Wonderful Life: Liberty Films, Astrid Stawiarz / Getty Images Fun fact: Grimes didn't see the film until 34 years later in 1980. 14. Jimmy Hawkins as Tommy Bailey in It's A Wonderful Life: Liberty Films, Fox / Via video.foxnews.com Fun fact: Hawkins met with the LA City Council to proclaim It's A Wonderful Life Day. 15. Carol Coombs as Janie Bailey in It's A Wonderful Life: Liberty Films Fun fact: Coombs got her mother to give her piano lessons for the film. 16. Mara Wilson as Susan Walker in Miracle on 34th Street: Twentieth Century Fox, Jason Kempin Fun fact: Wilson is a writer now. 17. And Brett Kelly as Thurman Merman in Bad Santa: Columbia Pictures, Jamie Mccarthy / Getty Images Fun fact: Brett Kelly beat out Angus T. Jones (who played Jake on Two and a Half Men) for the role of Thurman Merman.