Mine is most definitely ACC. I love it, and i can't get enough. It's just so awesome
like any Lilly song, but this one stands out to me. I have many favorites per album. Sorry this list is so long lol
Gourmandises
Moi... Lolita
L'Alizé
Parler Tout Bas
Veni Vedi Vici
Gourmandises
MCE
ACC 
JEAM/IFU
Toc De Mac
JPVA/INT
Youpidou/Youpidoo
Psych
MJ
Fifty Sixty (and the Rolf Honey Remix)
Mon Taxi Driver
PLP
Lilly Town
La Isla Bonita (Mexican Edition)