episode one song help!

help please .. im australian so we a a little behind the US ..

its in the first episode (im pretty sure .. i was just flicking around channels)

the one where mia + jack are in bed...

caitlin JUST kissed alicia for the first time, after they got out of the bar, where the 2 men sent drinks their way

umm... jack gets a call, and leaves the room, so mia called somebody else to find out the where-being of some business man her and jack meet with the next day to play golf (??)

its a female voice in the song


thank u!