Too much, too soon?
Carey Mulligan might have been horrified by the thought of getting Botox at 25, but not all celebrities have been as restrained. They are dubbed the Freeze Face generation -- those who don't plan on trying to repair signs of ageing in their 40s or even their 30s: they want their faces to stay as they are right now, for good.
Lindsay Lohan, Megan Fox and Hilary Duff have all been reported to have indulged in a spot of Botox in their early 20s. Heidi Montag of US reality show The Hills posed on the cover of People magazine at the age of 23, boasting of having had 10 cosmetic procedures in one day, including Botox.
Supermodel Cindy Crawford still looks amazing at 43 but she admitted last year to having had Botox -- not in her 40s as one might expect, but at least over a decade ago. Perhaps this is why she's "holding together pretty good", as she told the same interviewer.
Yet which is worse -- a little, too young, or too much, later?
Nicole Kidman's immobile forehead has long been a source of fascination to Hollywood watchers, although she denied last year that she has had Botox . (Sharon Osbourne, queen of cosmetic procedures, was having none of it, likening Kidman's forehead to a "flatscreen TV".)
Dr Jane Mulrooney says overdoing it on the Botox is worse than having none at all.
"Having Botox is the opposite of going to the gym. When you go to the gym, you build up muscle; Botox decreases the appearance of the muscle under the skin.
"The balance is not to decrease the muscle mass so much that you're just looking at skin and bone. That is what you saw with Kylie Minogue and the prominent vein in her forehead.
"The muscle had been Botoxed away and all you could see was the facial structure underneath."