Kathleen Mary "Kathy" Griffin (born November 4, 1960) is an American actress, comedian, model, writer and producer. Born in Oak Park, Illinois, she moved to Los Angeles in 1978, where she studied drama at the Lee Strasberg Theatre and Film Institute and became a member of improvisational comedy troupe The Groundlings. In the 1990s, Griffin began performing as a stand-up and also appeared as a guest star on several television shows. She achieved recognition in a supporting role on the NBC sitcom Suddenly Susan (1996–2000).

Her breakthrough came on the Bravo reality show Kathy Griffin: My Life on the D-List (2005–2010), which became a ratings hit for the network and earned her two Emmy Awards for Outstanding Reality Program. Griffin has released four comedy albums, with all of them receiving Grammy Award nominations. Her first album, For Your Consideration (2008), made her the first female comedian to debut atop of the Billboard Top Comedy Albums chart. In 2009, she released her autobiography Official Book Club Selection: A Memoir According to Kathy Griffin, which topped The New York Times Best Seller list. Griffin has also taped stand-up specials with HBO and Bravo.

Eva Jacqueline Longoria (born March 15, 1975) is an American actress, best known for portraying Gabrielle Solis on the ABC television series Desperate Housewives. Longoria received a nomination for the 2006 Golden Globe Award for Best Actress in a Comedy Series for her performance on Desperate Housewives.

Longoria first rose to fame on television for portraying Isabella Braña on the CBS soap opera The Young and the Restless from 2001 to 2003. She became nationally recognized in the 2000s after appearing in several high-profile advertising campaigns and numerous men's magazines, reaching #14 in the FHM "Sexiest Women 2008" poll, and having appeared on the cover of various international women's magazines including Vogue, Marie Claire and Harper's Bazaar. Longoria has also starred in films such as Harsh Times (2005), The Sentinel (2006) and Over Her Dead Body (2008).

Eva Jacqueline Longoria was born in Corpus Christi, Nueces County, Texas, the youngest of four daughters born to Mexican-Americans Enrique Longoria, Jr. and Ella Eva Mireles. She was raised Roman Catholic. The Longoria family originated in Spain and has resided in Texas since before the creation of the United States, predating the English-speaking settlers.

Kristin Chenoweth (born July 24, 1968) is an American singer and actress, with credits in musical theatre, film and television. She is best known on Broadway for her performance as Sally Brown in You're a Good Man, Charlie Brown (1999), for which she won a Tony Award, and for originating the role of Glinda in the musical Wicked (2003). Her best-known television role is Annabeth Schott in NBC's The West Wing. As Olive Snook on the ABC comedy-drama Pushing Daisies, she won a 2009 Emmy Award. Chenoweth stars in the ABC TV series GCB, which premiered in March 2012.

An Oklahoma native, Chenoweth sang gospel music as a child and studied opera before deciding to pursue a career in musical theatre. In 1997, she made her Broadway debut in Steel Pier. Besides You're a Good Man, Charlie Brown and Wicked, Chenoweth's stage work includes five City Center Encores! productions, Broadway's The Apple Tree in 2006 and Promises, Promises in 2010, as well as Off-Broadway and regional theatre productions.

Chenoweth had her own TV series Kristin in 2001, and has guest starred on many shows, including Sesame Street and Glee, for which she was nominated for Emmy awards in 2010 and 2011. In films, she has played mostly character roles, such as in Bewitched (2005), The Pink Panther (2006) and RV (2006). She has also played roles in made-for-TV movies, done voice work in animated films and the animated TV series Sit Down, Shut Up, hosted several award shows and released several albums of songs, including A Lovely Way to Spend Christmas (2008) and Some Lessons Learned (2011). Chenoweth also penned a 2009 memoir, A Little Bit Wicked: Life, Love, and Faith in Stages.

Joshua Winslow "Josh" Groban (born February 27, 1981) is an American singer, songwriter, musician, actor, and record producer. His first four solo albums have been certified multi-platinum, and in 2007, he was charted as the number-one best selling artist in the United States with over 21 million records in that country. To date, he has sold over 24 million albums worldwide, and is the top selling classical artist of the 2000s in the US, according to Nielsen SoundScan.

Groban originally studied acting, but as his voice changed, it developed into a "significant instrument". Groban attended the Los Angeles High School for the Arts, a free public school where students received a conservatory-style education. His life changed when his vocal coach, Seth Riggs, submitted a tape of Josh singing "All I Ask of You", from The Phantom of the Opera, to Riggs' friend, producer, composer and arranger David Foster. Foster called him to stand in for an ailing Andrea Bocelli to rehearse a duet, "The Prayer," with Celine Dion at the rehearsal for the Grammy Awards in 1998.Rosie O'Donnell immediately invited him to appear on her talk show. Foster asked him to sing at the California Governor's Gray Davis' 1999 inauguration. He was cast on Ally McBeal by the show's creator, David E. Kelley, performing "You're Still You" for the 2001 season finale.