T-ara turns...

T-ara (Korean: 티아라, Japanese: ティアラ, often stylized as T-ARA or T♔ARA) is a South Korean girl group formed by Core Contents Media in 2009. Before their debut, there was a high level of interest in the group as they were called "Super Rookies" and had been training for three years prior to debut.
Originally a five-member group, they released their first song "Good Person" for the soundtrack of the Korean drama Cinderella Man in April 2009. In June 2009, members Jiwon and Jiae left the group, delaying the group's debut. The next month, T-ara regrouped to become a six-member group with the addition of Boram, Qri, and Soyeon, and released their debut single "거짓말" ("Lies").
In July 2010, T-ara introduced a new member, Ryu Hwayoung, to become a seven-member group. T-ara uses a rotating leader system, and has a different member of the group elected as leader each year, in order to give both the group and the individual members the opportunity to grow in a new direction.
In 2011, T-ara signed a $4.3 million contract with management company J-ROCK for their Japanese debut, the highest out of all the girl groups debuting in Japan. Their major record label is EMI Music Japan while their management and promotional marketing takes place under J-ROCK. The group's first single, a remake of their 2009 hit "Bo Peep Bo Peep", debuted at #1 on the Oricon weekly charts with 49,712 copies sold, the first for a debuting Korean girl group ever in history.

                                                     T-ARa Roly poly daebakk!!!
Sources:  en.wikipedia.org