Do you ever wonder what stars' like Lady Gaga's real names are?  After all, who names their child 'Pink', or 'Snoop Dogg'? Katy Perry's real name isn't Katy Perry.

OMG Now reports a list of 20 stars' real names because Lady Gaga turned 25 on Monday, and her fans, known as 'Little Monsters' are interested in knowing what it is.  Her stage name actually came from a mis-typed text from her producer! Her real name is Stefani Joanne Angelina Germanotta.