Cindy Lou WHO? The celebrity you didn't know played your favorite Whoville resident

Christmas spirit swept the nation in 2000 when Cindy Lou Who more than doubled the size of our favorite Christmas villain's heart in 'How the Grinch Stole Christmas'. With a kind soul and an interesting hairdo, to say the least, Cindy Lou Who became a holiday icon.

So it might surprise you that just seven years later, the actress who portrayed Cindy showed up in New York City's Upper East Side -- a long way's away from Whoville. That's right, folks, Cindy Lou Who and little Jenny Humphrey from 'Gossip Girl' have one huge thing in common -- they're both played by Taylor Momsen.

SEE ALSO: Get ready for your jaw to drop: See what Ruthie Camden from '7th Heaven' looks like now

In case your memory needed some jogging (story continues below):


As if it were an extension of her 'Grinch' character, Jenny Humphrey was the sweet but naive little sister of Dan, Serena's eternal flame. And although she started out as everyone's little sister, she eventually transitioned into a rebellious, tough cookie determined to take down queen bee Blair Waldorf.

Look back at Momsen throughout her career:
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Taylor Momsen through the years
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Cindy Lou WHO? The celebrity you didn't know played your favorite Whoville resident
Taylor Momsen listening to Jim Carrey in a scene from the film 'How The Grinch Stole Christmas', 2000. (Photo by Universal/Getty Images)
12/14/00 New York, NY. Taylor Momsen at the Toy Fair Whobilation, celebrating Universal Pictures'' and Imagine Entertainment's upcoming live-action release of 'Dr. Seuss'' How The Grinch Stole Christmas!' Photo by Robin Platzer/Twin Images/Online USA, Inc.
Taylor Momsen during The 15th Carousel Of Hope Ball - Arrivals at Beverly Hilton Hotel in Beverly Hills, California, United States. (Photo by SGranitz/WireImage)
Taylor Momsen (Photo by Jesse Grant/WireImage)
Taylor Momsen (Photo by Jesse Grant/WireImage for The WB Television Network)
NEW YORK - MAY 17: (L-R) Actors Leighton Meester, Blake Lively, Nicole Fiscella and Taylor Momsen attend the CW Network Upfront at Madison Square Garden on May 17, 2006 in New York City. (Photo by Evan Agostini/Getty Images)
(EXCLUSIVE, Premium Rates Apply) Taylor Momsen of 'Gossip Girl' (Photo by Kevin Mazur/WireImage for The CW Network)
LAS VEGAS, NV - MAY 08: Singer Taylor Momsen of The Pretty Reckless performs onstage during Rock in Rio USA at the MGM Resorts Festival Grounds on May 8, 2015 in Las Vegas, Nevada. (Photo by Kevin Mazur/Getty Images)
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Seemingly living a life parallel to her on-screen personas, Momsen went through quite a transition herself, especially when compared to the sweet Who that convinced the Grinch to return all the Christmas presents he stole. In 2009 she joined an "aggressive rock & roll" band called The Pretty Reckless who produced an album called 'Going to Hell', including songs with names like 'Make Me Wanna Die' and 'F**ked Up World'. You get the picture.

Momsen aptly adopted a punk-rock countenance to match her grungy music -- rarely seen without intensely dark eye makeup, platinum blonde hair and ivory skin, the former gossip girl totally rocks the bad girl look.

Forever friends

A post shared by Taylor Momsen (@taylormomsen) on



Flashback

A post shared by Taylor Momsen (@taylormomsen) on


So, if you've been wondering for 15 years, Cindy Lou WHO?, your question is finally answered: Taylor Momsen.

Xoxo, Cindy Lou.

In case you weren't convinced that Momsen is no longer the little girl from 'How the Grinch Stole Christmas':
Taylor Momsen Hints at Playboy Pictorial
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