The second time she auditioned for the show, she sang her own original song, "Bubbly", and was rejected once again. Its deluxe edition was released on September 3, 2008 in Japan and November 11, 2008 worldwide. The album's first single, "Bubbly", peaked at number five on the US Billboard Hot 100 and number two on the Pop 100.However, Caillat expressed gratitude at the judges' decision, saying "I was shy. The album was certified 2× Platinum by the RIAA with shipments to U. It also topped the Hot Adult Contemporary Tracks and Hot Adult Top 40 Tracks charts for 19 and 14 weeks, respectively.spending fourteen weeks at number two on the Adult Pop Songs and topping the Adult Contemporary chart.Elsewhere, it reached the top-twenty in four other countries and top-forty in the remaining territories."The Little Things", was released as the third single in Germany on March 7, 2008 and in United States in October 2008.The single did not chart well in the US, and was her weakest charting single from the album, peaking at number seven on US Billboard Bubbling Under Hot 100.The first single, "Fallin' for You", was released on June 29, 2009.The "lilting" mid-tempo ballad "features an instantly catchy chorus and toe tapping melody," as defined by Melinda Newman of Hit Fix.
She was also part of the group that won Album of the Year at the 2010 Grammy Awards for her background vocals and writing on Taylor Swift's Fearless album.
Most of the album was co-written by Jason Reeves and features guitarist David Becker on two tracks. Caillat had writer's block during the recording sessions, so she enlisted her friends Kara Dio Guardi and Jason Reeves, and they went to Hawaii for three weeks, rented a beach house and wrote songs.
Breakthrough debuted at number-one on the US Billboard 200 chart, with first-week sales of 106,000 copies, becoming her first album to debut at the top and an improvement of the first week sales of her debut album Coco (2007), which started at number five with only 51,000 copies.
Caillat rose to fame through social networking website Myspace.
At that time, she was the number-one unsigned artist of her genre.