Just how sexy is Charlotte Gainsbourg? Well, her pop's Serge, her mom's Jane Birkin, she's a "celebrated French actress," and then there's this leggy press photo we happened upon. More importantly -- this is a music blog, after all -- how sexy is "5:55"? Gainsbourg had Air write the music, Nigel Godrich produce, Jarvis "Seductive Barry" Cocker pen the lyrics, ...