Shawn Machel Johnson (born January 19, 1992) is an American artistic gymnast. She was the 2008 Olympic balance beam gold medalist and all-around, and floor exercise silver medalist, the 2007 all-around World Champion, and the 2007 and 2008 U.S. all-around champion. In 2009, Johnson became the winner of the season eight edition of Dancing with the Stars.

Johnson was born in Des Moines, Iowa, the only child of Doug and Teri Johnson. Her parents enrolled her in a gymnastics class at age three after they noticed her climbing cabinets and jumping off tables. At age six, Johnson was one of Liang Chow's first students when he opened a gymnastics school in West Des Moines.

Johnson attended a public school, Valley High School. She was on the honor roll, attended football games, and participated in extra-curriculars. Through 2008, Johnson maintained a more balanced lifestyle than typical of elite female gymnasts. She limited her gymnastics training to 25 hours per week, as opposed to the more typical 40 hours.

Anastasia Valeryevna "Nastia" Liukin (Russian: Анастасия "Настя" Валерьевна Люкина; born October 30, 1989) is an American artistic gymnast. She is the 2008 Olympic individual all-around Champion, the 2005 and 2007 World Champion on the balance beam, and the 2005 World Champion on the uneven bars. With nine World Championships medals, seven of them individual, Liukin is tied with Shannon Miller for the second-highest tally of World Championship medals; Alicia Sacramone has ten. Liukin has also tied Miller's record as the American gymnast having won the most medals in a single non-boycotted Olympic Games.

The daughter of two former Soviet champion gymnasts, Olympic gold medalist Valeri Liukin – the first man to do a triple backflip – and World Champion rhythmic gymnast Anna Kotchneva, Nastia Liukin was born in Moscow and moved to the United States as a young child. She began gymnastics after spending time in the gym while her parents coached. Liukin is coached by her father at the World Olympic Gymnastics Academy, her family's gymnastics club in Plano, Texas.

Derek Hough ( /ˈhʌf/; born May 17, 1985) is an American dancer, choreographer, musician and actor. A world champion in Latin American Dance, Hough has appeared since September 2007 (Seasons 5 - 11 and Season 13) on the hit U.S. television series Dancing with the Stars, where he is currently a three-time champion (with Brooke Burke, Nicole Scherzinger, and Jennifer Grey), one-time finalist (with Ricki Lake), three-time semi-finalist (with Jennie Garth, Joanna Krupa, and Maria Menounos), and a quarter-finalist (with Lil' Kim). Hough has earned three Creative Arts Primetime Emmy nominations for Outstanding Choreography (2009 and 2010 ) for his work on the show.

Prior to joining Dancing with the Stars, Hough starred as Ren in the 2006 original cast production of Footloose: The Musical at the Novelo Theatre in London's West End, as well as on the 2006 U.K. national tour. Hough's West End performance earned him a nomination as The Stuart Phillips London Newcomer of the Year in the Whatsonstage.com Theatregoers' Choice Awards. Hough made his Broadway debut on January 8, 2010, starring with Kym Johnson and Mary Murphy in Burn the Floor for the final four performances of the show's Broadway run. A founding member of the Ballas Hough Band (formerly Almost Amy), Hough shares lead vocals, plays guitar and has several songwriting credits on the band's self-titled debut CD, released by Hollywood Records in March 2009.

Mark Alexander Ballas Jr. (born May 24, 1986) is an American dancer.

Ballas is a professional ballroom dancer on the ABC program Dancing with the Stars. He began competing on the show in the fall of 2007. He was nominated for an Emmy for Outstanding Choreography in 2011. He is also a singer/songwriter/musician and released his first solo CD HurtLoveBox in March 2011.

Ballas was born in Houston, Texas, the son of dancers Corky Ballas and Shirley Ballas (née Rich). His paternal grandparents were of Mexican, Spanish, and Greek background, and his mother is British.^{[citation needed]} His paternal grandfather, George Ballas, was the inventor of the Weed Eater lawn-trimming device.

Ballas attended Rosemead Preparatory school in South London, and was in the same year as acclaimed British ballet dancer Max Westwell of the English National Ballet.

At the age of 11, he earned a full time slot at the Academy, as well as earning a full scholarship to the college. In 2005, he was awarded "Performer of the Year". He then moved on to win championships at The British Open to the World, The US Open to the World and The International Open to the World. With his former partner Julianne Hough, he won the Junior Latin American Dance Championship and the gold medal at the Junior Olympics.^{[disambiguation needed ][citation needed]}

David Michael Letterman (born April 12, 1947) is an American television host and comedian. He hosts the late night television talk show, Late Show with David Letterman, broadcast on CBS. Letterman has been a fixture on late night television since the 1982 debut of Late Night with David Letterman on NBC. Letterman recently surpassed friend and mentor Johnny Carson for having the longest late-night hosting career in the United States of America.

Letterman is also a television and film producer. His company Worldwide Pants produces his show as well as its network follow-up The Late Late Show with Craig Ferguson. Worldwide Pants has also produced several prime-time comedies, the most successful of which was Everybody Loves Raymond, currently in syndication.

In 1996, David Letterman was ranked #45 on TV Guide's 50 Greatest TV Stars of All Time.

Letterman was born in Indianapolis, Indiana. His father, Harry Joseph Letterman (April 1915 – February 1973), was a florist of British descent; his mother Dorothy Letterman (née Hofert, now Dorothy Mengering), a Presbyterian church secretary of German descent, is an occasional figure on the show, usually at holidays and birthdays.