Spoted a Leica in the film "Before Midnight"
I think it was a M6 (unclear if TTL or not).
Audrey Tautou (of "Amélie" fame) is also a Leica shooter, and known for shooting portraits of her interviewers using hers:
My dealer works for Samy's, the leading camera shop in LA, and tells me Leicas are very popular among the Hollywood set, but often times more as a fashion accessory than anything else.
Fazal Majid (www.majid.info)