Big Time Rush in 2010, the band announced plans to release their debut album that year, which would also serve as the soundtrack to the series. The boys stated that the album would feature a few songs from the series, as well as several new songs. On September 21, 2010, the boys released another promotional single, titled Til I Forget About You, to promote the release of their debut album.The single, like many of their others, failed to chart on any charts worldwide. On September 25, 2010, the second season of Big Time Rush premiered with a total of 4.0 million viewers.
On October 11, 2010, Their debut album, B.T.R., was released. It features the previously heard songs, like Big Time Rush, "Halfway There", "City Is Ours", and "Til I Forget About You". The album also provided new material from the band that was previously unheard. The album debuted at #3 on the Billboard 200, selling 67,000 units in its first week of release. The album peaked at #4 on the "Top Internet Albums" and #1 on "Top Soundtracks". Shortly after the album's release, the song Big Night debuted on the Billboard Hot 100 at number 79, making it one of their highest peaking singles, and their second at the time to chart on the US singles chart. The album was later certified Gold for shipments/sales of 500,000 copies in the U.S.
In November of 2010, it was announced that a Christmas special of Big Time Rush would debut later in the month. It was also announced that a Christmas EP would be released to coincide with the episode. The EP, titled Holiday Bundle was released on November 30, 2010. The episode, which debuted on December 4, and saw the boys trying to quickly record a Christmas EP for their boss so they can go home for the holiday. After recording a song titled "Beautiful Christmas", the head of their record label states that he wants the next two songs to be celebrity duets. They later record the song All I Want For Christmas Is You, originally performed by Mariah Carey, with fellow Nickelodeon star Miranda Cosgrove, who is playing herself. The third duet is done with rapper Snoop Dogg.
In January of 2011, it was announced that Boyfriend would be released as their official debut single. "Boyfriend" was released as their fifth single to US iTunes, but the 1st single to mainstream US radio on February 15, 2011. The version featuring Snoop Dogg was released to mainstream radio on February 15, 2011. "Boyfriend" so far peaked at #72 on the Billboard Hot 100, becoming their most successful song to date. "Boyfriend" also peaked at number 36 on the Billboard Pop Songs chart in March 2011. In 2011, an alternate version (remix) of "Boyfriend" (featuring New Boyz) was leaked onto the internet, and is now available on iTunes.The boys later announced that they would be going on their first headlining tour, after the airing of the second season of Big Time Rush comes to a close.