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Christina María Aguilera (born December 18, 1980) is an American recording artist and actress. Aguilera first appeared on national television in 1990 as a contestant on the Star Search program, and went on to star in Disney Channel's television series The Mickey Mouse Club from 1993 to 1994. Aguilera signed to RCA Records after recording "Reflection", the theme song for the animated film Mulan (1998).

In 1999, Aguilera came to prominence following her debut album Christina Aguilera, which was a commercial success spawning three number one singles on the Billboard Hot 100—"Genie in a Bottle", "What a Girl Wants", and "Come On Over Baby (All I Want Is You)." Her sophomore and her debut Latin-pop album, Mi Reflejo (2000), a Christmas third studio album, My Kind of Christmas (2000), and several collaborations followed which garnered Aguilera worldwide success, though she was displeased with her lack of input in her music and image. After parting from her management, Aguilera took creative control over her fourth studio album, Stripped (2002). The album's second single, "Beautiful", was a commercial success and helped the album's commercial performance amidst controversy over Aguilera's image. Aguilera followed up Stripped with the soul, jazz and blues inspired, Back to Basics (2006), released to positive critical acclaim. The album produced three singles "Ain't No Other Man", "Hurt" and "Candyman". Four years later Aguilera released her sixth studio album, Bionic (2010), which incorporated aspects of R&B, electropop, and synthpop and was met with mixed reviews and low sales. Aguilera's seventh studio album is set to be released in 2012.

John Joseph Travolta (born February 18, 1954) is an American actor, dancer, and singer. Travolta first became known in the 1970s, after appearing on the television series Welcome Back, Kotter and starring in the box office successes Saturday Night Fever and Grease. Travolta's acting career declined in the early 1980s and continued to deteriorate for the rest of the decade. His career enjoyed a resurgence in the 1990s with his role in Pulp Fiction, and he has since continued starring in Hollywood films, including Face/Off, Ladder 49, and Wild Hogs. Travolta was nominated for the Academy Award for Best Actor for Saturday Night Fever and Pulp Fiction. He won the Golden Globe Award for Best Actor - Motion Picture Musical or Comedy for his performance in Get Shorty.

Travolta, the youngest of six children, was born and raised in Englewood, New Jersey, an inner-ring suburb of New York City. His father, Salvatore Travolta (November 1912 – May 1995), was a semi-professional American football player turned tire salesman and partner in a tire company. His mother, Helen Cecilia (née Burke, January 1912 – December 1978), was an actress and singer who had appeared in The Sunshine Sisters, a radio vocal group, and acted and directed before becoming a high school drama and English teacher. His siblings, Joey, Ellen, Ann, Margaret, and Sam Travolta, have all acted. His father was a second-generation Italian American and his mother was Irish American; he grew up in an Irish-American neighborhood and has said that his household was predominantly Irish in culture. He was raised Roman Catholic, but converted to Scientology in 1975.

Idina Kim Menzel ( /ɪˈdiːnə mɛnˈzɛl/; born Mentzel on May 30, 1971) is an American actress, singer and songwriter.

She rose to prominence for her performance as Maureen Johnson in the Broadway musical Rent, a role which she reprised for the 2005 film adaptation. In 2004 she won the Tony Award for originating the role of Elphaba in the hugely successful Broadway blockbuster Wicked.

Menzel was born in Queens, New York. Her mother, Helene, is a therapist, and her father, Stuart Mentzel, worked as a pajama salesman. Her family is Jewish; her grandparents immigrated from Russia and elsewhere in Eastern Europe. Her family lived in East Brunswick, Somerset and Marlboro, New Jersey from when she was in kindergarten to third grade, but she considers herself raised in Syosset, New York, with her younger sister Cara. Idina changed her last name to Menzel to better reflect the pronunciation the Mentzel family had adopted in America. When Menzel was 15 years old, her parents divorced and she began working as a wedding and bar mitzvah singer, a job which she continued throughout her time at New York University's Tisch School of the Arts. She earned a Bachelors of Fine Arts degree in Drama at NYU prior to being cast in Jonathan Larson's rock musical Rent. She was friends with actor Adam Pascal before they worked together in Rent.

Stefani Joanne Angelina Germanotta (/ˈstɛfəniː dʒʌrməˈnɑːtə/ STE-fə-nee jurr-mə-NAH-tə; born March 28, 1986), known by her stage name Lady Gaga, is an American singer and songwriter. Born and raised in New York City, she primarily studied at the Convent of the Sacred Heart and briefly attended New York University's Tisch School of the Arts before withdrawing to focus on her musical career. She began performing in the rock music scene of Manhattan's Lower East Side, and was signed with Streamline Records by the end of 2007. During her employment as a songwriter for the record company, her vocal abilities captured the attention of recording artist Akon, who signed her to his label Kon Live Distribution.

Lady Gaga came to prominence as a recording artist following the release of her debut album The Fame (2008), which was a critical and commercial success that topped charts around the world and included the international number-one singles "Just Dance" and "Poker Face". After embarking on the The Fame Ball Tour, she followed the album with The Fame Monster (2009), which spawned the worldwide hit singles "Bad Romance", "Telephone" and "Alejandro". The album's success allowed her to embark on the eighteen-month long Monster Ball Tour, which later became one of the highest-grossing concert tours of all time. Her most recent album Born This Way (2011) topped the charts of most major markets and generated more international chart-topping singles, including "Born This Way", "Judas" and "The Edge of Glory". Besides her musical career, she involves herself with humanitarian causes and LGBT activism.