Katy Perry

Katy Perry introduced her nerdy alter-ego Kathy Beth Terry in her video for “Last Friday Night (T.G.I.F.)."
Many famous people have chosen to adopt a "second self," or alter ego - like musicians who develop personas as a way to push themselves creatively or break into a new genre, or comedians who use them as a way to go unrecognized. Most celebrities have one, maybe two alter egos. One female rapper even has as many as 19. Comedian Sacha Baron Cohen has several hilarious alter egos - including Ali G, Borat, Brüno, and Admiral General Haffaz Aladeen - who have all been featured on film and on TV. He uses his funny personas for comedic purposes, and he even appeared at the Oscars as his Aladeen alter ego. Female pop stars like Beyoncé and Katy Perry often performed as their alter egos, Sasha Fierce and Kathy Beth Terry, respectively. Other singers and actors who have donned alternate personalities include Miley Cyrus and Jennifer Lopez. While some may question the benefits of an alter ego or why a celebrity would adopt several different names, these successful stars showcase how personas can help bolster one's career. And if these celebs are anything like Bae, they know that sometimes, all good things must end. Even pop personas. RIP Sasha Fierce.
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Katy Perry introduced her nerdy alter-ego Kathy Beth Terry in her video for “Last Friday Night (T.G.I.F.)."

Justin Bieber has a glasses wearing rapper alter ego Shawty Mane.

In 2009, Jennifer Lopez, AKA J-Lo, introduced her mysterious new alter ego, Lola.

Will Smith first rose to stardom in the late-80s as his alter ego, the Fresh Prince. He was so successful that he made the jump from rapping to acting with his hit sitcom The Fresh Prince of Bel-Air. He switched back to Will Smith as he started his film career.

Miley Cyrus rose to stardom partially in thanks to her Disney pop star alter ego Hannah Montana.

Marky Mark is the rap alter ego of the now Oscar-nominated actor Mark Wahlberg.

Beyoncé Knowles had the sexy alter ego Sasha Fierce. The singer released her album I Am... Sasha Fierce in November of 2008. However, Beyoncé chose to kibosh Sasha Fierce by 2010.

Rapper Eminem, born Marshall Mathers, has an ultra-violent alter ego named Slim Shady.

In 2002, Christina Aguilera showed the world that she wasn't a kid anymore when she unveiled her provocative alter ego, Xtina.

David Bowie developed his androgynous alter ego Ziggy Stardust in 1972 to coincide with the release of The Rise and Fall of Ziggy Stardust and the Spiders from Mars.

Lady Gaga left fans scratching their heads when she appeared at the 2011 Video Music Awards as her male alter ego Jo Calderone.

Paul McCartney took on the alter ego of The Fireman as a way to escape musical expectations. The former Beatle says, "We always say, The Fireman can do anything. I think you can get into a bit of a straightjacket; you know, I am 'Paul of The Beatles' or I am 'Paul McCartney' who makes albums a certain way. So it's very liberating."

Mariah Carey says that her alter ego, Mimi, represents her "true person." You know, the more laidback version of Mariah.

Joaquin Phoenix confused the entertainment industry when he debuted his scruffy hip-hop alter ego, himself as a rapper, in 2010 for the mockumentary I'm Still Here.

Nicki Minaj has a total of 19 alter egos: Cookie, Onika, Chun Li, Barbie Balla, Female Weezy, The Harajuku Barbie, Lap Dance Nika, Martha Zolanski, Nicki Lewinsky, Nicki Teresa, Nicki the Boss, Nicki the Ninja, Nicole, Norman, Point Dexter, Barbie Balla, Roman Zolanski, Rosa, and Tyrone.

The U2 frontman has unleashed three alter egos throughout his career: Mirrorball Man, MacPhisto, and The Fly.

In 2008, Courtney Love said that her crazy behavior was due to her alter ego, Cherry Kookoo.

Comedian Sacha Baron Cohen has several hilarious alter egos, including Ali G, Borat, Brüno, and Admiral General Haffaz Aladeen. In 2016, Cohen showed fans more than just his new persona, Nobby.

Janet Jackson introduced her alter ego, Damita Jo, as a way to push the limits of her sexuality.

In 1986, Prince recorded an album as his female alter ego, Camille.

In 1999, Garth Brooks developed his alter ego, Chris Gaines, as a way to explore his interest in rock and roll.

Paul Reubens first developed his alter ego, Pee-wee Herman, for a hilarious stage show. The character was a smash hit and went on to be featured in films and TV.

Martin Short's alter ego Jimmy Glick is an inappropriate talk show host who has seemingly no boundaries.

British comedian Steve Coogan may have been Oscar-nominated for his film Philomena, but he is most well-known as his superficial alter ego Alan Partridge.

Hank Williams used his alter ego Luke the Drifter to play religious songs that didn't fit in his gritty country music repitoire.

Andy Kaufman developed the rude alter ego Tony Clifton as a way to shake up the stale attitudes of the entertainment industry. Clifton appeared on Taxi, Late Night with David Letterman, and The Fantastic Miss Piggy Show.

Arcade Fire started performing as the glammed up dance-rock group the Reflektors to coincide with their 2013 album Reflektor.