Question: Which American singer, songwriter, fashion designer, actress, and television personality of the band No Doubt wrote the song "Happy Now?"?

<P0-S0>  is a song recorded by American rock band No Doubt. <P0-S1>  It was released as the fifth single from their third studio album "Tragic Kingdom" (1995). <P0-S2>  The single was issued on January 20, 1997 as a CD single. <P0-S3>  It was written by Gwen Stefani, Tom Dumont, and Tony Kanal, with its production handled by Matthew Wilder. <P0-S4> "Happy Now?" <P0-S5>  Its lyrics allude to Stefani's relationship status with Kanal, who broke up their seven-year relationship when creating "Tragic Kingdom". <SEP> <P1-S0> Reba Sabrina Hinojos (born September 16, 1984), better known by her stage name Sabrina Bryan, is an American singer, actress, author, songwriter, fashion designer, choreographer, dancer, and television personality best known as a member of the girl group The Cheetah Girls, and for starring in the Disney Channel Original Movie of the same name and its sequels, "The Cheetah Girls 2" and "". <P1-S1>  Before she appeared on television, Bryan was a dancer, and trained at Hart Academy of Dance, located in La Habra, California. <SEP> <P2-S0>  She is a co-founder and the lead vocalist of the band No Doubt that experienced major success after their breakthrough studio album "Tragic Kingdom" (1995) along with various successful singles, including "Just a Girl", "Don't Speak", "Hey Baby", and "It's My Life". <P2-S1>  During the band's hiatus, Stefani embarked on a solo pop career in 2004 by releasing her debut studio album "Love. <P2-S2>  Angel. <P2-S3>  Music. <P2-S4>  Baby. <P2-S5> " Inspired by pop music from the 1980s, the album was met with both critical and commercial success. <P2-S6> Gwen Renée Stefani ( ; born October 3, 1969) is an American singer, songwriter, fashion designer, actress, and television personality. <P2-S7>  It spawned three commercially successful singles: "What You Waiting For? <P2-S8> ", "Rich Girl", and "Hollaback Girl", the latter reached number one on the "Billboard" Hot 100 while also becoming the first US download to sell one million copies. <P2-S9>  In 2006 Stefani released her second studio album "The Sweet Escape". <P2-S10>  The album produced two successful singles: "Wind It Up" and the album's title track "The Sweet Escape". <P2-S11>  Her third solo album "This Is What the Truth Feels Like" was released in March 2016 and became her first solo number-one album on the "Billboard" 200. <SEP> <P3-S0> Return of Saturn is the fourth studio album by American rock band No Doubt, released on April 11, 2000 by Trauma Records and Interscope Records. <P3-S1>  It marked the band's first album as a quartet, following the departure of original keyboardist Eric Stefani in 1994. <P3-S2>  After touring for two and a half years to promote their breakthrough third studio album, "Tragic Kingdom", No Doubt wrote several dozen songs for its follow-up and eventually settled on working with producer Glen Ballard. <P3-S3>  Creating the album became a tumultuous process lasting two years, during which there was dissension among band members and between the band and its label. <P3-S4>  The album was completed after the band returned to the studio and recorded what became two of the album's singles.