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.
The first single, "Fallin' for You", was released on June 29, 2009.
The fourth and final single from the album in the United States was, "Somethin' Special (Beijing Olympic Mix)", released on July 29, 2008. It was released to give support to the American athletes participating in the 2008 Beijing Summer Olympics, in China, and also was included on the AT&T Team USA Soundtrack.
Caillat also sings on "You" by Schiller and appears in the music video.
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.
Caillat was recognized as BMI's songwriter of the year.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.She also recorded a French translated version of this song.In 2009, she was named Billboard magazine's 94th-best-selling music artist of the 2000s. Her father, Ken Caillat, co-produced Fleetwood Mac's Rumours (1977) and Tusk (1979) albums.When she was an infant, her parents gave her the nickname "Coco", which she would later name her debut album.