The most known top 3 celebrities in 2011

1. Lady Gaga

Stefani Joanne Angelina Germanotta (born March 28, 1986), better known by her stage name Lady Gaga, is an American pop singer-songwriter. After performing in the rock music scene of New York City's Lower East Side in 2003 and later enrolling at New York University's Tisch School of the Arts, she soon signed with Streamline Records, an imprint of Interscope Records. During her early time at Interscope, she worked as a songwriter for fellow label artists and captured the attention of recording artist Akon, who recognized her vocal abilities, and signed her to his own label, Kon Live Distribution.

2. Justin Bieber

Justin Drew Bieber (born March 1, 1994) is a Canadian pop/R&B singer-songwriter and actor. Bieber was discovered in 2008 by Scooter Braun, who happened to come across Bieber's videos on YouTube and later became his manager. Braun arranged for him to meet with Usher in Atlanta, Georgia, and Bieber was soon signed to Raymond Braun Media Group (RBMG), a joint venture between Braun and Usher,  and then to a recording contract with Island Record offered by L.A. Reid. His debut single, "One Time", released worldwide in 2009, peaked in the top ten in Canada and charted in the top thirty in several international markets. His debut release, My World, followed on November 17, 2009, and was eventually certified platinum in the United States. He became the first artist to have seven songs from a debut album chart on the Billboard Hot 100.

3. U2

U2 are an Irish rock band from Dublin. Formed in 1976, the group consists of Bono (vocals and guitar), The Edge (guitar, keyboards and vocals), Adam Clayton (bass guitar), and Larry Mullen, Jr. (drums and percussion). U2's early sound was indebted to post-punk but eventually grew to incorporate influences from many genres of popular music. Throughout the group's musical pursuits, they have maintained a recognisable sound built on melodic instrumentals, highlighted by The Edge's textural guitar playing and Bono's expressive vocals. Their lyrics, often embellished with spiritual imagery, focus on personal themes and sociopolitical concerns.