It's not really possible to name just one. These are who I would say are the top five:
Justin Bieber
yes. starting off from being a song writer to successfull pop singer. ofcourse. she is the biggest pop star out now, that needs brains to achieve or serious luck
Lady Gaga. Hands down.
Michael Jackson
Lady gaga or Katy Perry or Adel
I Was a Mermaid and Now I'm a Pop Star - 2011 was released on: USA: 8 September 2011 (internet)
well if a pop star is not pop they are not a pop star there a singer
justin is more famous. he is the biggest pop star on the planet
the movies called Biggest fan starring Dream street
Demi lovato became a pop star almost three years ago since the first camp rock movie aired on T.V
pop and me
yes very