2NE1 1st Mini Album  is the debut extended play of South Korean girl group 2NE1. It was released on July 28, 2011, by YG Entertainment. It contains seven songs composed and produced by Korean producers Teddy and Kush. The album was released on July 8, 2009.
2NE1's first song was "Lollipop", digitally released on March 27, 2009. The song was created for LG Cyon to promote their Lollipop phone, and it was a joint release with Big Bang; the commercial/music video debuted on March 28, 2009. Although it was not a promoted single (as it was an advertisement song, there were problems with network chart eligibility), "Lollipop" proved to be a strong chart hit, going to #1 on various online charts and topping music television network M.Net's online chart for four weeks in a row. It was also profiled in Perez Hilton's blog. However, questions were raised about the group's future, as the song's success was attributed to the popularity of Big Bang.
On April 30, Yang Hyun-suk revealed that 2NE1's debut song would be a hip hop/reggae song, and that it would be digitally released on May 6, 2009. Titled "Fire", the song was fully written and produced by 1TYM's Teddy. Teasers of the song were released on their official website at the beginning of May, with a 20-second clip released on May 1.
|2.||"I Don't Care"||3:59|
|3.||"In the Club"||3:45|
|4.||"Let's Go Party"||3:48|
|7.||"Lollipop" (Bonus track with Big Bang)||3:05|
On its first day, it recorded 50,000 sales in pre-orders. Their debut was a success on the Korean charts, and it headed straight to number 1 for its debut week, in which It sold 13,675 copies.
YG stated that the EP had already reached the 80,000 sales mark within 2 weeks, which is impressive since 2NE1 was only a rookie at the time.  By the end of 2009 2NE1 sold approximately 100,000 copies. It continued to show strong sales by charting on the 2010 year end chart for Gaon, selling an additional 40,949 copies. Total sales for the release are believed to be around 140,949 copies.
The group was rewarded with three Cyworld Digital Music Awards, with both "Lollipop" and "Fire" winning "Song of the Month" awards, and the group itself winning "Rookie of the Month" for May 2009. They received their first Mutizen award during their fourth stage performance in SBS Inkigayo on June 14, 2009. They received their second Mutizen award on SBS Inkigayo on June 21, 2009.