- Started acting professionally at age 3 in a Shake-N-Bake commercial.
- At age 6, made film debut as Cindy Lou Who with Jim Carrey in 2000's How The Grinch Stole Christmas.
- Starred with younger sister Sloane Momsen in We Were Soldiers (2002), in which they played Mel Gibson's daughters.
- Auditioned for the lead role in the Disney Channel series Hannah Montana and was in the Top 3 contenders, but ultimately lost the role to Miley Cyrus.
- Best known for her role as Jenny Humphrey in the CW teen drama Gossip Girl.
- Her alt-rock band the Pretty Reckless released debut album Light Me Up in 2010. A follow-up album, Hit Me Like a Man, was released in 2012.
- Collette Momsen — Mother
- Sloane Momsen — Sister
- Michael Momsen — Father
Sign up and add shows to get the latest updates about your favorite shows - Start Now
- 1. The Marvelous Mrs. Maisel Season 3 Trailer Teases a Gilmore Girls Reunion
- 2. Why Logan Roy May Have Been Behind That Succession Finale Twist
- 3. The Walking Dead Revealed Alpha and Beta's Gruesome Origins
- 4. Power's Latest Victim Had a Feeling Death Was Coming
- 5. Stranger Things Writers Reveal Some Movies Related to Season 4
- 6. Krysten Ritter's El Camino Cameo 'Shocked' Aaron Paul
- 7. Here's Why Walter White's Cameo on El Camino Was So Important for the Breaking Bad Movie