"Bubbly" is the debut single by American singer Colbie Caillat from her debut album, Coco (2007). Written by Caillat and Jason Reeves and produced by Mikal Blue, the song was released as the album's lead single on May 15, 2007. It remains Caillat's biggest hit in the US to date, and her only single to reach the top ten of the Billboard Hot 100.

The single's music video, directed by Liz Friedlander, aired on MTV, VH1 and CMT. A still from the music video was used as the cover for Caillat's debut album, Coco. The single is also featured in the hit PlayStation 2 karaoke game SingStar Pop Vol 2, released in late September 2008 in the United States. It was also featured in SingStar Hottest Hits in PAL regions.

"Bubbly" was written by Colbie Caillat and Jason Reeves. It is an alternative pop song, folk song, and acoustic song. "Bubbly" is written in the key of A and primarily features a gentle guitar instrumentation which uses a capo of seventh fret. The guitar uses open D tuning (low to high): D–A–D–F♯–A–D.

Caillat commented on the lyrical composition of the song in an interview with Wilson Country News on February 20, 2008, following her live performance on The View, "I didn't write "Bubbly" for any [special] guy. I wrote it about the feelings you get when you have a crush on somebody, and when they give you butterflies in your stomach and they just make you smile."

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