It's the french actress and singer Arielle Dombasle
Wow! She's like a real-life version of Maris, Niles' (ex) wife on Frasier. So small and narrow she could fit through jail bars, be mistaken for a hat rack, takes a sniff of something and feel full, etc etc. (Except we never saw Maris.... but she fits all the show's descriptions of her body descriptions perfectly.)
The NY Times, T Style Women's Spring Fashion 2013
The Real Lee Radziwill
Photographer: Mario Sorrenti (interior Francois Halard)
Make-up: Fulvia Farolfi
Fashion Editor: Carolina Irving