Britney: The Singles Collection is the second greatest hits album of American singer Britney Spears. It was released on November 10, 2009, by Jive Records, to commemorate her ten-year anniversary since entering the music industry. The compilation was released in many different formats, including a one-disc edition, a CD+DVD edition and a box set, which contained twenty-nine singles, each packaged in its own slip case with original cover art. The CD+DVD edition as well as the box set contained a DVD with Spears's music videos. The album included one new track, "3", produced by Max Martin and Shellback.
The Singles Collection was praised by contemporary critics, who noted Spears's impact and influence on pop music during her first decade within the music industry. The album entered the top forty in Australia, Japan, Mexico, New Zealand and the United States as well as in a number of European countries. "3" was released as the lead single from the album. In the United States, it debuted at number one on the Billboard Hot 100, becoming her first song to do so.
On July 12, 2009, Spears confirmed through her Twitter account that she had begun recording new material, stating she was going into the studio with Swedish songwriter and producer Max Martin. On September 23, 2009, Jive Records officially announced the release of a greatest hits titled The Singles Collection through Spears's official website, in celebration of Spears's ten-year anniversary in the music industry. The album followed her previous compilation, Greatest Hits: My Prerogative, released in 2004. The release date was confirmed to be November 24, 2009 and the album included a new song titled "3", produced by Martin. The compilation was available in two main editions, a standard version as well as a boxset. The standard version contained a single CD with seventeen tracks, including "3". The boxset contained her twenty-nine singles including "3", with each single packaged in its own slip case with original cover art, accompanied by an original b-side or remix. It also included a booklet featuring iconic images and facts about each track as well as a DVD featuring all of Spears's music videos to date in chronological order.
On October 14, 2009, Jive Records announced in a new press release that the date for the standard version was moved up to November 10, 2009. The date for the release of the boxset remained the same. The following day, a CD+DVD version was announced to be released on November 10, 2009 in all countries except in North America. This version included the standard version tracklist as well as the single "I'm Not a Girl, Not Yet a Woman".
"3" was confirmed as the only single from the album, released on September 29, 2009 along with the announcement of The Singles Collection. It was released to radio stations on September 29, 2009. The song received positive reviews from critics, and debuted at number one on the U.S. Billboard Hot 100, breaking many chart records. It made Spears the first artist in over three years to debut at the top position and the only non-American Idol artist in eleven years to do so. It was the sixteenth song in the chart history to debut at the top position and also the shortest title for a song reaching the top of the chart. "3" also debuted at number one in Canada and reached top ten positions in Australia and the European nations of Belgium (Wallonia), Czech Republic, Finland, France, Ireland, Norway, Sweden and the United Kingdom.
The compilation album received universal critical acclaim from music critics. Stephen Thomas Erlewine of Allmusic gave the collection five stars and compared it to Greatest Hits: My Prerogative, saying that although they had the same length, they were "different listening experiences". He also noted that the more recent tracks "help push The Singles away from teen pop and toward pure dance-pop bliss. [...] It does result in a stronger overall listen, since there are no slow patches here, just a parade of relentless hooks and rhythms that wound up defining the sound of a decade". Mayer Nissim of Digital Spy also gave the album five stars stating that "[it] perfectly captures the career of one of the best singles artists of the last ten years. Running from '...Baby One More Time' to 'Radar', you get a single-disc timeline that shows a progression in style and substance from school uniform-wearing pop ingénue to sultry motorik saucepot. [...] The only arguable weak link is the Madonna-featuring 'Me Against the Music', but in this context what once looked like a respectful passing of the baton now seems like an unconditional surrender of pop Queendom to its rightful heir." The reviewer also noted the impact on popular culture and pop music of Spears, highlighting "Oops!... I Did It Again", "Toxic" and "Stronger".
Brian Linder of IGN commented "2004's Greatest Hits: My Prerogative [...] captured the highlights from Britney's heyday, but lacks the more mature club-oriented material that she's churned out in recent years. That helps make this collection a justifiable fan purchase". Mike Diver of BBC Online called it "the definitive Britney album" and added that "these songs don’t just make a mark, lingering in the memory – they are essential pieces of the past ten years of pop history, and deserve better than dismissal by so-called discerning listeners". Evan Sawdey of PopMatters called the album "a high-gloss collection of tunes that selectively sums up the career of one of the biggest female pop singers of the past decade. It’s a disc that’s light on filler [...] and heavy on Spears’ more high-energy cuts, which, without question, play to her strengths as a performer".Sputnikmusic stated "This is Britney's second greatest hits, and it's incredibly strong. It focuses mainly on her more upbeat, danceable numbers, with a few slower ones thrown in to change things up without disrupting the constant stream of quality pop songs" and summarized the review adding "As one of the most successful artists of the decade, is it any wonder this compilation is so good?".
In the United States, The Singles Collection debuted at number twenty-two in the Billboard 200, selling 26,800 copies in its first week. The album has sold over 209,000 copies in the United States. In Canada, the album was certified gold by the Canadian Recording Industry Association (CRIA) for sales over 40,000 copies. The album debuted at number fifteen in Mexico and was certified gold by the Asociación Mexicana de Productores de Fonogramas y Videogramas (AMPROFON) for shipments over 30,000 units. On November 23, 2009, the album debuted in the Australian Albums Chart at number twenty-three. The same week, it debuted at number twenty-two in New Zealand. The album reached the top forty in Belgium (Wallonia), Denmark, Greece, New Zealand and Norway, and also charted in Belgium (Flanders), Finland, Spain and the Netherlands. In January 2011, The Singles Collection re-entered the charts in Ireland and the United Kingdom, at number fifty-one and forty-seven, respectively.