Who is a very popular, well-known, and LIKED celebrity?

Someone like... marilyn monroe, or elvis but more current. More.. modern.

I was thinking maybe Obama?

(this is for a project so.. )

thank you so much for all your opinions!
Oprah... hmm... not a bad idea!
=)
And yes, I know Obama isn't a celebrity. I'm not dumb. I just need someone who is well-known. And well.. celebrities are well-known. lmao. Whoever is popular is what i'm looking for (that people like)