"Thinking of You" is a song written and recorded by American singer and songwriter Katy Perry from her second studio album, One of the Boys (2008).

"Thinking of You" deals with a break-up in which Perry does not want to move on but has no choice, and feels nostalgic of a previous lover while in a relationship with another man.

The song peaked at number 29 on the Billboard Hot 100 chart, becoming the album's only single not to reach the Top 10 in the United States.

In South America, the song was included in the international soundtrack of Brazilian soap opera India, a Love Story and became very successful.

Amateur video of Perry performing an entirely acoustic version at the Hotel Café in Los Angeles as early as 2006 is available on YouTube.

[3] After music video premiere in December 2008, "Thinking of You" was chosen as the third single promoting the album, seeing its first official release on January 12, 2009, when it debuted on the US mainstream radio stations.

[15] David Balls from Digital Spy described the track as a "serious offering designed to show off her vocal and songwriting talents", and compared it to the catalogues of Alanis Morissette and band Evanescence.

[17] Jon Caramanica of The New York Times favored the song's production, stating that Perry works better with melody and emotion.

He contrasted the song—which he described as "gently and compellingly angry"—with Perry's singles of sexual themes, and concluded that "feeling deeply is shocking enough".

[18] For Contactmusic.com, Kelda Manley called the song "high quality" whereas NME reviewer Alex Miller jokingly regarded it as having "all the emotional subtlety of a flamethrower".

[19][20] A writer for The Boston Globe found similarities to Alanis Morissette's musicality in the track, such as her "sour melodicism" and vocals.

It rose fifteen spots one week after, giving the track the title of "Greatest Digital Gainer" for that chart issue.

The video ends with the revelation that Perry stabbed her lover in the white room in the back, as she sings tearfully while covered in blood before the shot spans to the side, showing the knife on the floor.

[citation needed] Perry revealed on her blog that she had already started filming a second and official music video in the first week of December 2008, directed by Melina Matsoukas.

In another scene, Perry is tearfully applying makeup and putting on a funeral veil, and in another she is opening a letter informing her that her boyfriend has died in battle.