... well for celebrities it's their image! Here's a few you probably didn't know

Lea Michele- Lea Sarfati

Olivia Wilde - Olivia Jane Cockburn (ouch.. smart move on that one!)

Nicole Scherzinger - Nicole Prescovia Elikolani Valiente Scherzinger (yes less is more girl)

Nicki Minaj - Onika Tanya Maraj

Pink - Alecia Moore

Rihanna - Robyn Rihanna Fenty

Tina Fey - Elizabeth Stamatina Fey

Demi Moore - Demetria Gene Guynes

And now theses celebs took a much different approach..

Portia de Rossi - Amanda Rogers

Bruno Mars - Peter Gene Hernandez

Cee Lo Green - Thomas DeCarlo Callaway

Elton John - Reginald Kenneth Dwight

Carmen Electra - Tara Patrick

Got a favorite celeb name changeup?