The Fine Brothers are Benny and Rafi Fine, two online producers who are known for their successful React video series (Kids React, Teens React, and Elders React), their several timed spoiler series, narrative web series, as well as creating the first transmedia sitcom on YouTube, MyMusic.

The Fine Brothers have been creating content online since 2004, and have found success on YouTube where their main channel, TheFineBros is currently #39 on the most subscribed list with over 1.5 million, along with over 300 million video views. The Fine Brothers also have a secondary channel, under the name TheFineBros2; which they launched on May 14, 2009. The secondary channel has accumulated over 146,000 subscribers and 13.4 million video views as of July 6, 2012. They release behind the scenes content, as well as clips from their news podcast "All We Know" on the secondary channel.

The Fine Brothers launched a series titled Kids React on October 16, 2010 with Kids React to Viral Videos #1 (Double Rainbow, Obama Fail, Twin Rabbits, Snickers Halloween). As of July 5, 2012 the video currently has 3.3 million views. The Kids React series features The Fine Brothers, off-camera, showing kids several viral videos or popular YouTubers and having the kids react to the videos. The most popular Kids React episode to date is KIDS REACT TO NYAN CAT, with over 11.6 million views as of July 5, 2012. The popularity of Kids React made it possible for the online series to win a special Emmy Award at the 39th Daytime Emmy Awards in 2012. The Emmy Award, that was given in cooperation with AOL, was awarded to the Fine Brothers for "Best Viral Video Series". Several videos and YouTube stars that have been reacted to by the kids include Smosh, who later reacted to the kids' reactions,planking and President Obama addressing the death of Osama bin Laden, among several other topics.

Robin Charles Thicke ( /ˈθɪk/; born March 10, 1977) is an American R&B singer-songwriter, musician, composer, and actor. Thicke's albums, which he previously released under the name Thicke, are noted for their feature of a predominantly R&B sound. Thicke has written hits for popular artists such as Jennifer Hudson, Usher, Mary J. Blige and Raven-Symoné. Thicke has also been acknowledged for his work in popular albums such as Confessions and Tha Carter III.

Thicke is a judge on the ABC show Duets.

Before his days as a singer-songwriter, Thicke had written "Love Is On My Side" on Brandy's self-titled album and a number of songs for 3T's "Sexual Attention" and collaborated with Jordan Knight, Jimmy Jam and Terry Lewis on several songs in Knight's 1999 album Jordan Knight. He also co-wrote the songs "When You Put Your Hands On Me" for Christina Aguilera's debut album and "No Tears on My Pillow" for Mýa's sophomore release, Fear of Flying. As an artist, he recorded and performed solely under his surname, Thicke. He would continue to do so until 2005.

William "Will" Sasso (born May 24, 1975) is a Canadian actor and comedian most notable for his five seasons as a cast member on the sketch comedy series MADtv from 1997–2002 and for starring as Curly Howard in the 2012 film reboot of The Three Stooges.

Sasso was born in Ladner, British Columbia, Canada. His parents are Italian immigrants. He graduated from Delta Secondary School in Delta, British Columbia in 1993. He credits his determination to become an actor and his respect for comedy to an "unhealthy addiction to television".^{[citation needed]}

At the age of 15 he landed his first agent and quickly began booking roles in television and film. Before moving from Vancouver to Los Angeles, Sasso starred for five seasons as quirky teen `Derek Wakaluk' on the award-winning Canadian dramatic series Madison. Official mini-biographies claim that this experience ..."[allowed] him to hone his acting and improvisational skills... [and provided] him with enough money to buy a television of his own."

Ryan Thomas Gosling (born November 12, 1980) is a Canadian actor and musician. He began his career as a child star on the Disney Channel's Mickey Mouse Club (1993–95) and went on to appear in other family entertainment programs including Are You Afraid of the Dark? (1995), Goosebumps (1996), Breaker High (1997–98) and Young Hercules (1998–99). His first serious role was as a Jewish neo-Nazi in The Believer (2001), and he then built a reputation for playing misfits in independent films such as Murder by Numbers (2002), The Slaughter Rule (2002), The United States of Leland (2003) and Stay (2005).

Gosling came to the attention of a wider audience in 2004 with a leading role in the romantic drama The Notebook, for which he won four Teen Choice Awards and an MTV Movie Award. His performance as a drug-addicted teacher in Half Nelson (2006) was nominated for an Academy Award and his performance as a socially inept loner in Lars and the Real Girl (2007) was nominated for a Golden Globe Award. In 2007, he starred in the courtroom thriller Fracture.

Justin Drew Bieber ( /ˈbiːbər/ BEE-bər, born March 1, 1994) is a Canadian Pop/R&B singer-songwriter, musician, and actor. Bieber was discovered in 2008 by Scooter Braun, who came 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 Records offered by L.A. Reid. Bieber's debut single, "One Time", was released in 2009 and peaked in the top twenty in Canada and charted in the top thirty in several international markets. His debut album, the seven-track EP My World, followed in November 2009, and was soon 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.