Question: Taylor Michel Momsen,  frontwoman of The Pretty Reckless, played Jenny Humphrey on what CW series?

Context paragraphs:
Follow Me Down (The Pretty Reckless song): "Follow Me Down" is a song by American rock band The Pretty Reckless from their second studio album, "Going to Hell" (2014).  The song was written by the band's lead singer Taylor Momsen, while production was done by Kato Khandwala.  It was serviced to active rock radio in the United States on November 18, 2014, serving as the album's fifth and final single.  The track's intro features former pornographic actress Jenna Haze simulating an orgasm.

Kill Me: "Kill Me" is a song by American rock band The Pretty Reckless, released as a single on December 7, 2012 by Interscope Records.  The song was initially intended to serve as the lead single from the band's then-untitled second studio album, as announced by lead singer Taylor Momsen through her Twitter account.  However, after The Pretty Reckless moved record labels from Interscope to Razor & Tie, "Kill Me" was left out of the band's second album, "Going to Hell" (2014), although it was included as a bonus track on the Japanese edition of the album.

Heaven Knows (The Pretty Reckless song): "Heaven Knows" is a song by American rock band The Pretty Reckless from their second studio album, "Going to Hell" (2014).  It was released on November 19, 2013 as the album's second single.  The song was written by Taylor Momsen and Ben Phillips, while Kato Khandwala was responsible for the production.  "Heaven Knows" is the band's first single to top a "Billboard" chart (Mainstream Rock) and the second single to top UK Rock Singles Chart, following their debut single "Make Me Wanna Die" (2010).  The song later entered the Alternative Songs chart, peaking at number 20.

Just Tonight: "Just Tonight" is a song by American rock band The Pretty Reckless from their debut studio album, "Light Me Up" (2010).  Band members Taylor Momsen and Ben Phillips co-wrote the song with its producer, Kato Khandwala.  It was released on December 23, 2010, as the third and final single from the album.

Jenny Humphrey: Jennifer Tallulah "Jenny" Humphrey is one of the characters in both the "Gossip Girl" and "The It Girl" series of novels by Cecily von Ziegesar.  She is portrayed by Taylor Momsen in the "Gossip Girl" television adaptation on The CW.

Taylor Momsen: Taylor Michel Momsen (born July 26, 1993) is an American singer, songwriter, former actress, and model.  She is known for being the lead singer and frontwoman of the American rock band The Pretty Reckless.  She is also known for portraying the character of Jenny Humphrey on the CW teen drama series "Gossip Girl" (2007–2012) and Cindy Lou Who in the film "Dr. Seuss' How the Grinch Stole Christmas" (2000).

Make Me Wanna Die: "Make Me Wanna Die" is a song by American rock band The Pretty Reckless from their eponymous debut extended play (2010) and their debut studio album, "Light Me Up" (2010).  The song was written by Taylor Momsen, Ben Phillips, and Kato Khandwala, and produced by the latter.  It was released on April 14, 2010 as the lead single from both the EP and the album.

The Pretty Reckless: The Pretty Reckless is an American rock band from New York City, formed in 2009.  The band consists of Taylor Momsen (lead vocals, rhythm guitar), Ben Phillips (lead guitar, backing vocals), Mark Damon (bass) and Jamie Perkins (drums).

The Pretty Reckless (EP): The Pretty Reckless is the self-titled debut EP by American rock band The Pretty Reckless.  The album was released on June 22, 2010, by Interscope Records.  The album's lead single, "Make Me Wanna Die", was released on May 13, 2010.

The Pretty Reckless discography: American rock band The Pretty Reckless has released three studio albums, two extended plays, 11 singles and 12 music videos. Originally named The Reckless, the band was formed in early 2009, with Taylor Momsen in the vocals, Ben Phillips in lead guitar, Mark Damon in bass and Jamie Perkins in drums.

Supporting paragraphs: The Pretty Reckless Taylor Momsen
Answer: Gossip Girl