Along with her TV-driven U.K. success, Lewis signed an American recording deal with Clive Davis' J Records in February 2007. By the end of the year, she had launched her debut album, Spirit, in England, and watched it go to the top of the charts (along with the single "Bleeding Love"). The American release followed in 2008 with similar success; it reached the top of the Billboard 200 and received a Grammy nomination for Best Pop Album. Echo, Lewis' follow-up, was issued in 2009, featuring collaborations with Ryan Tedder, Xenomania, and Timbaland. Also in 2009, Lewis released the single "I See You (Theme from Avatar)." Written by James Horner and Simon Franglen, the song was featured on the soundtrack to the hit James Cameron film Avatar. The following year, Lewis promoted Echo with the Labyrinth tour. Inspired by the 1986 fantasy film of the same name, the tour was showcased on the DVD/CD The Labyrinth Tour: Live from the O2 in 2010. In 2011, Lewis began recording her third studio album, Glassheart, showcasing writing and production by a bevy of names including Ryan Tedder, Fraser T. Smith, Dallas Austin, and others. The album had a long gestation period, during which it slowly became more electronic dance-oriented. It finally appeared in Europe in October 2012.
Glassheart didn't perform well on the charts -- it only went silver in the U.K. and never appeared in the U.S. -- and she split with her management, Modest!, in February 2013. At the end of the year, she released Christmas, With Love, a seasonal record in the style of A Christmas Gift for You from Phil Spector. ~ Stewart Mason, Rovi