No, iPhone has no A2DP Bluetooth profile, and it has been a real surprise. It only offers HSP/HFP Bluetooth profile (Headset Profile/Handsfree Profile) for mono headsets, which is not enough – you can use it only for phone conversations. A2DP's first distinguisher is Stereo of high quality for music listening.

You can try using Bluetooth dongles, if you don't mind paying another hundred of dollars and get a clumsy composition with another one device to charge. These are, for instance, Belkin Bluetooth Dock Adapter for iPod, Oakley iCombi Bluetooth stereo adapter for iPod, iMuffs Bluetooth Transceiver, or 8bananas STK-200 iPods Dock Connector which works good with iPhone, as users state.