Adolescence (from Latin: adolescere meaning "to grow up") is a transitional stage of physical and psychological human development generally occurring between puberty and legal adulthood (age of majority). The period of adolescence is most closely associated with the teenage years, although its physical, psychological and cultural expressions can begin earlier and end later. For example, although puberty has been historically associated with the onset of adolescent development, it now typically begins prior to the teenage years and there has been a normative shift of it occurring in preadolescence, particularly in females (see early and precocious puberty). Physical growth, as distinct from puberty (particularly in males), and cognitive development generally seen in adolescence, can also extend into the early twenties. Thus chronological age provides only a rough marker of adolescence, and scholars have found it difficult to agree upon a precise definition of adolescence. A thorough understanding of adolescence in society depends on information from various perspectives, most importantly from the areas of psychology, biology, history, sociology, education, and anthropology. Within all of these perspectives, adolescence is viewed as a transitional period between childhood and adulthood whose cultural purpose is the preparation of children for adult roles.

Katheryn Elizabeth Hudson (born October 25, 1984), known by her stage name Katy Perry, is an American singer, songwriter and actress. Perry grew up with gospel music, and during her first year of high school she pursued a music career as Katy Hudson, releasing her first studio album called Katy Hudson which failed to chart. She recorded a solo album later, which was never released. After signing with Capitol Music Group in 2007, her fourth record label in seven years, she adopted the stage name Katy Perry.

She first gained recognition with the release of her first mainstream album, One of the Boys in 2008, which spawned three Billboard Hot 100 top-ten songs—"I Kissed A Girl", "Hot n Cold" and "Waking Up In Vegas". Perry supported the album with her Hello Katy Tour. In 2010, her third studio album, Teenage Dream (2010), which topped the Billboard 200 chart, and spawned five number one singles—"California Gurls", "Teenage Dream", "Firework", "E.T." and "Last Friday Night (T.G.I.F.)"—Teenage Dream was the only album (after Michael Jackson's Bad)—to do so, and the first female in history to achieve this milestone. She embarked on the California Dreams Tour, which grossed nearly $60 million worldwide. Perry re-released the album under the name of Teenage Dream: The Complete Confection on March 26, 2012, and the re-release has already spawned the number-one single "Part of Me".

Megan Denise Fox (born May 16, 1986) is an American actress and model. She began her acting career in 2001 with several minor television and film roles, and played a regular role on the Hope & Faith television show. In 2004, she made her film debut with a role in Confessions of a Teenage Drama Queen. In 2007, she was cast as Mikaela Banes, the love interest of Shia LaBeouf's character, in the blockbuster film, Transformers, which became her breakout role. Fox reprised her role in the 2009 sequel, Transformers: Revenge of the Fallen. Later in 2009, she starred as the eponymous lead in the film Jennifer's Body.

Fox is considered a sex symbol and frequently appears on men's magazine "Hot" lists, including Maxim and FHM.

Fox is of Irish, French and Native American ancestry, and was born in Oak Ridge, Tennessee to Darlene and Franklin Fox. She was raised as a Roman Catholic and attended Catholic school for 12 years. Fox's parents divorced when she was young. Fox's mother later remarried, and she and her sister were raised by her mother and her stepfather, Tony Tonachio. She said that the two were "very strict" and that she was not allowed to have a boyfriend or invite friends to her house. She lived with her mother until she made enough money to support herself.