'Don't Cha' is the debut single by American girl group the Pussycat Dolls. The song was originally recorded by American recording artist Tori Alamaze, and was released as her debut single in March 2005, on Universal Records. After Universal Records dropped her from the label, Cee-Lo Green gave the track to the Pussycat Dolls. The song was released in 2005 as the lead single from the Dolls' debut studio album PCD. "Don't Cha" is about a girl who teases a guy that she is hotter than his girlfriend.

"Don't Cha" has received mostly positive reviews from most music critics who praised its R&B grooves and it high dose of energy. The song has also achieved commercial success by topping charts in Australia, Belgium, the Republic of Ireland, the New Zealand, Switzerland and the United Kingdom, as well as reaching the top ten in many other countries.

The music video of the song portrayed the Pussycat Dolls lingering in various locations dressed in seductive clothing as they dance and sing. "Don't Cha" was performed by the Dolls in a number of live appearances including their first headlining PCD World Tour and the second worldwide tour Doll Domination Tour.

In the United States, the song debuted on the Billboard Hot 100 at position ninety-five on the issue dated May 7, 2005. On its sixteenth week the song peaked at number two, making the Pussycat Dolls highest single to date on Billboard's Hot 100. It topped the Hot Dance Club Play chart, where it stayed for three consecutive weeks. "Don't Cha" took 3-1/2 years to reach the 2 million mark in paid downloads. According to according to Nielsen Soundscan, as of January 24, 2010 the song has sold 2,226,000 paid digital downloads in the United States. The song was certified platinum by the Recording Industry Association of America (RIAA), for shipment of a million copies of the single.

In Oceania the song topped on its first week at number one in both Australia and New Zealand, where in Australia it stayed there for seven non-consecutive weeks. It was certified two-timesplatinum certification by the Australian Recording Industry Association (ARIA), and in New Zealand it was certified gold, selling over 7,500 copies, according to the Recording Industry Association of New Zealand (RIANZ). Across Europe, the song reached number one on the European Hot 100 Singles. In the United Kingdom and Ireland the song debuted at number one. It managed to stay at the top for three and four consecutive weeks respectively. As of June 22, 2009 "Don't Cha" is the Dolls' best-selling single in the United Kingdom, with 521,872 copies. It was certified silver by the British Phonographic Industry (BPI). The song has also reached the peak in a number of European countries including Belgium (Flanders), Germany, Norway and Switzerland.