JUSTIN BIEBER AND SELENA GOMEZ RING

The music video, directed by Vashtie Kola, was posted by Bieber on his YouTube channel on June 13, 2009, almost a month before the single was released to iTunes. Bieber's mentor, Usher and one of his closest friends, Ryan Butler make appearances in the video. It features Bieber clad in a grey hooded sweatshirt grinning mischievously into the camera. As of January 2010, the video had been viewed over 100 millon times on the internet. Bieber made a comment stating "It was really cool going from my webcam to professional videos". In a review of the video Entertainment Weekly's Leah Greenblat said: "Bieber does seem to share many of the qualities that made his idols the pop/R&B superstars they've become, including a clear, supple voice, pinup-boy looks, and bona fide instrument skills".

The song has also achieved international success. It debuted in Belgium (Flanders) at twenty-six and peaked at twelve on the bubbling under chart, equivalent to peaking at sixty-two on the main chart. It debuted on the Belgium (Wallonia) tip chart at twenty-six in its first week, the week ending January 16, 2010, and has since peaked at six, equivalent to peaking at forty-four on the main chart. The song debuted in Austria at seventy-one on the week of September 4, 2009, and peaked at thirty, remaining on the chart for eleven weeks. "One Time" debuted at fourteen in Germany, which became its peak position on the chart. The song debuted in Australia at number eighty-two and later reached a peak of twenty-three. In Ireland the song debuted at forty-five on the Irish Singles Chart. It has since peaked at thirty-one on the chart. The song debuted on the UK Singles Chart at 135, and jumped to fourteen on January 10, 2010. A week later on January 17, 2010, the song jumped again to number eleven, just missing out on the top ten. The song peaked at number six in New Zealand, and at thirteen in France. The song entered at number ninety-five on the Billboard Hot 100 for the week of July 25, 2009. The song stayed on the chart for nearly six months before eventually peaking at number seventeen on the chart. Although the song didn't gain momentum until the near end of 2009, it managed to chart at number eighty-nine on the 2009 Billboard Year-End Hot 100, and eighty-one on the Year-End Canadian Hot 100. It was also number seventy-five on the Year End Hot Digital Singles. After lying dormant outside the top twenty for a few weeks, on the week labeled January 9, 2010, due to the release of "One Time: My Heart Edition" on iTunes, and increased sales of My World, the song made a thirty spot jump from forty-seven to number seventeen, reaching a new peak on the chart. The song debuted on the Billboard Pop chart at number eighty-four as the highest debut of the week. It has since peaked at number fourteen. It reached number twelve in Canada, where it remained on the chart for twenty consecutive weeks. The single was certified Platinum in Canada by CRIA in September 2009. It was certified Platinum by the RIAA in the United States in January 2010, selling over a million copies. As of February 2011, the single was sold 2,132,000 times.

Bill Lamb of About.com called the song a "perfect kickoff to the career of Justin Bieber", noting the song had an effect of a younger Chris Brown, commended the production of The-Dream and Tricky Stewart for making the single contemporary and commercial. However Lamb criticized the song for being too "generic", and that Bieber had little room to show his voice. Billboard's Michael Menachem called the song "a hallmark pop song that also taps into a prevalent teen hip-hop aesthetic". He also compared Bieber to Brown on the track, and said that "[Bieber's] tenor brings to mind [Brown's] vocal debut on "Run It!" in 2005, when he, too, was 15 and on the cusp of stardom". Unlike Lamb, Menachem said the song gave Bieber's vocals plenty of room to shine as he confidently breaks into the chorus. Leah Greenblat of Entertainment Weekly named the song one of the hottest songs of fall of 2009, saying that Bieber's "pop-soul bonafides with this refreshingly age-appropriate chronicle of young love."

The song received positive reviews from critics, commending its production, vocals and quality of lyrics. The song was a commercial success, reaching the top twenty in Canada, US, Germany, United Kingdom, France and New Zealand and also charted in several other countries. The single has been certified Platinum in Canada and the United States. The accompanying music video portrays Bieber at a house party, and features his mentor, Usher and hometown friend, Ryan Butler. As of January 2010, the video had been viewed over 100 million times on the internet. The video is now the fifth most viewed video in YouTube history. Bieber performed the song in a number of live appearances including The Dome, The Next Star, and Dick Clark's New Year's Rockin' Eve with Ryan Seacrest.

"One Time" is the debut song of Canadian recording artist Justin Bieber. The song was produced and written by RedZone Entertainment's Christopher "Tricky" Stewart, Terius "The-Dream" Nash, and Kuk Harrell and production duo The Movement. It is the first single released from his debut EP, My World. It was first solicited to mainstream and rhythmic radio on May 18, 2009. It was released via digital download in the United States and Canada on July 7, 2009, and was released in several other countries during autumn 2009. An acoustic version of the song, called the "My Heart Edition" was released to iTunes on December 22, 2009. The song, moderately paced with R&B, pop, and hip-hop influences, is an ode to young love.

In the music video, Usher, Bieber and Butler all portray themselves as the latter two are at Usher's house playing video games. Bieber receives a phone call from Usher, in which he asks him if could he watch the house until he gets back. After agreeing, Bieber holds a house party and tries to get close to one girl in particular, played by Kristen Rodeheaver, but is disappointed because he thought they were bonding but at the end of the video when they are sitting together at the pool, she kisses him on the cheek, then leaves. He then stands up and gets caught by Usher.