Sama Vaknin, author of "Malignant Self Love: Narcissism Revisited," says many celebrities are "addicted to getting feedback from other people, but they resent depending on it," USA Today reported Tuesday.
He said there are numerous recent examples of fame addiction:
-- Britney Spears saying she's taking a break because she's tired of paparazzi attention, but then scrawling on the wall of a Hollywood boutique, "Britney Spears woz here!! With her hubby Kevin Federline, who is the sexiest man alive!"
-- Lindsay Lohan bemoaning in her single Rumors that she needs "a little space to breathe/Can you please respect my privacy," but then making a highly publicized guest appearance on (now ex-) boyfriend Wilmer Valderrama's TV series, "That '70s Show."
Notable deaths of 2014 [PHOTOS]