Katheryn Elizabeth "Katy" Hudson, better known by her stage name Katy Perry, is an American award-winning recording artist, businesswoman, philanthropist, and actress from Santa Barbara. She is also the first female artist to have 5 number one singles on the U.S. Billboard Hot 100 from one album, (Teenage Dream) and the second artist to accomplish such a feat (the first artist being Michael Jackson with his 1987 album Bad)

In 2007, Perry signed a recording contract with Capitol Records and adopted her current stage name. 

The following year, she came to prominence with the June 2008 release of her second album, One of the Boys, which produced the singles "I Kissed a Girl", "Hot n Cold", "Thinking of You", and "Waking Up in Vegas". The project was further promoted through the Hello Katy Tour. In November 2009, she released a live album titled MTV Unplugged, which features performances of several tracks from One of the Boys. Perry's third record, Teenage Dream, was released in August 2010 and spawned the Billboard Hot 100 chart-topping singles "California Gurls", "Teenage Dream", "Firework", "E.T.", and "Last Friday Night (T.G.I.F.)". In doing so, it became the first album recorded by a female artist in history to produce five number-one hits, and the second album overall after Michael Jackson's August 1987 album Bad. Perry embarked on the California Dreams Tour following its release. In March 2012, Teenage Dream was re-released as Teenage Dream: The Complete Confection and produced the number-one single "Part of Me". Her fourth album, Prism, was released in October 2013 and contains the Billboard Hot 100 number 1 single "Roar". 

Katy Perry's lyrical wit has been likened to that of British female soloists Lily Allen and Kate Nash. However, her music is closer to the pop-rock of Avril Lavigne. The elements add up to a spunky, sassy approach uniquely Katy Perry.

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International R&B star Rihanna released her first album in 2005 and is known for such hits as "Umbrella," "Pon de Replay," "SOS" and "Disturbia."

Singer Robyn Rihanna Fenty was born on February 20, 1988, in St. Michael Parish on the Caribbean island of Barbados. She is the eldest of three children born to Monica Fenty, an accountant, and Ronald Fenty, a warehouse supervisor. Rihanna's childhood was marred by her father's struggles with addictions to alcohol and crack cocaine and her parents' marital problems—they divorced when she was 14 years old.

However, since that time, Rihanna's father has managed to conquer his addictions and the pair are now very close. "Now my dad is like the coolest person on the planet," Rihanna says. "He doesn't smother me. He lets me live my life. And he's been like that a lot, even when I was younger. He would watch me making a mistake and he wouldn't stop me. My dad, he lets me make it and then I learn."

Rihanna also struggled with crippling headaches for several years during her childhood, a condition she attempted to hide from her friends and classmates so that they would not think she was abnormal. "I never expressed how I felt," she remembers. "I always kept it in. I would go to school ... you would never know there was something wrong with me."

In 2009, Rihanna again made headlines again, becoming the center of a media firestorm after a domestic violence incident in which her then-boyfriend Chris Brown assaulted her before an awards show. The incident sparked a huge public outpouring of support for Rihanna, and she has since become a spokesperson against domestic violence. "This happened to me," she said in an interview with Diane Sawyer. "It can happen to anyone."

Rihanna was later romantically involved with Los Angeles Dodgers outfielder Matt 
Kemp, but the pair have since split ways.

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