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1.
famous with no discernible justification; having a fame that feeds solely on itself rather than any talent or other personal merit
"What's that person known for?"

"Does it matter? He's famous for being famous."
by Doctor Whom February 20, 2008
 
2.
(adj.) famous for no particular reason and especially for no reason having to do with that person's talent or accomplishments
"What exactly has Paris Hilton done to deserve all of this media attention?"

"She doesn't have to have done anything. She's famous for being famous."
by Doctor Whom July 16, 2007