Stars' Real Names vs. Celebrity Pseudonyms (PHOTOS)

What's in a name? Well, when it comes to a celebrity's moniker, there could be more than a few zeros riding on it.

From Old Hollywood icons whom we couldn't imagine having a different signature to new talent seeking a catchy pseudonym, a surprising number of celebrities have opted out of the names given to them by dear old mom and dad.

Elizabeth Grant is hoping to make it big as Lana Del Rey. Elton John ditched his birth name, Reginald Kenneth Dwight, before being knighted. And can you imagine calling funny man Chevy Chase "Cornelius Crane Chase"? Now, that's a mouthful.

Check out these celebrities who've ditched their birth-given names for the sake of show business:

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• Natalie Portman/Natalie Hershlag

• Lana Del Rey/Elizabeth Grant

• Louis C.K./Louis Szekely

• Charlie Sheen/Carlos Irwin Estevez

• Elton John/Reginald Kenneth Dwight

• Meg Ryan/Margaret Hyra

• Julie Andrews/Julia Elizabeth Wells

• Pat Benatar/Patricia Mae Andrzejewski

• Christie Brinkley/Christie Lee Hudson

• Michael Caine/Maurice Joseph Micklewhite

• Chevy Chase/Cornelius Crane Chase

• Elvis Costello/Declan Patrick MacManus

• Miley Cyrus/Destiny Hope Cyrus

• Portia De Rossi/Amanda Lee Rogers

• Dakota Fanning/Hannah Fanning

• Steven Tyler/Steven Victor Tallarico

• Alicia Keys/Alicia Augello Cook

• Chuck Norris/Carlos Ray Norris

• Larry King/Lawrence Harvey Zeiger

• Spike Lee/Shelton Jackson Lee

• Joan Rivers/Joan Alexandra Molinsky

• Katy Perry/Katheryn Elizabeth Hudson

• Tina Fey/Elizabeth Stamatina Fey

• Joaquin Phoenix/Joaquin Rafael Bottom

• Jack Black/Thomas Jacob Black

• Tina Turner/Anna Mae Bullock

• Christopher Walken/Ronald Walken

• Demi Moore/Demetria Gene Guynes

• Etta James/Jamesetta Hawkins

• Marilyn Monroe/Norma Jean Mortenson

• Fred Astaire/Frederick Austerlitz

• Mel Brooks/Melvin Kaminsky

• Vin Diesel/Mark Vincent

• Jamie Foxx/Eric Marlon Bishop

• Woody Allen/Allen Stewart Konigsberg

• Tom Cruise/Thomas Cruise Mapother IV

• Olivia Wilde/Olivia Jane Cockburn

• Helen Mirren/Ilyena Vasilievna Mironoff

• Bruce Willis/Walter Willis

• Nicolas Cage/Nicholas Kim Coppola

• Diane Keaton/Diane Hall

• Catherine Deneuve/Catherine Dorleac

• Ben Kingsley/Krishna Pandit Bhanji

• Carmen Electra/Tara Leigh Patrick

• Whoopi Goldberg/Caryn Elaine Johnson