In the same year, she collaborated with Jesse Mc Cartney on his album Right Where You Want Me, co-writing four songs called "Anybody", "Invincible", "Running Away" and "Feels Like Sunday".
In 2007, Dio Guardi worked with many notable artists, one of whom was Britney Spears.
In 2008, she was appointed to the position of executive vice president of talent development at Warner Bros.
Records, and has signed acts such as Jason Derülo and Iyaz.
She's a 2011 NAMM Music For Life Award winner, 2009 NMPA Songwriter Icon Award winner, 2007 BMI Pop Songwriter of the Year, and has received 20 BMI Awards for co-writing the most performed songs on the radio.
Dio Guardi served as a judge on American Idol for its eighth and ninth seasons.
Dio Guardi has also written for films and television series.
Dio Guardi co-wrote the song with lead singer Tyler Connolly, and is also featured as the love interest in the music video which was released on March 10, 2009. In 2009, Dio Guardi wrote "If I Can't Have You" for Meat Loaf's 2010 album, Hang Cool Teddy Bear and recorded the vocal as a duet with Meat Loaf.
She is also one of the writers for "Ghost", which was released as a single from Fefe Dobson's album Joy (2010).
In 2004, Dio Guardi co-wrote on six of the tracks off Kelly Clarkson's sophomore album Breakaway including Clarkson's hit "Walk Away".
She also worked with Christina Aguilera on her album Back to Basics in 2006, co-writing twelve of the thirteen tracks on disc one of the album, among them being "Ain't No Other Man", and "Back in the Day".