If you're looking for something small, then perhaps the
ANYCOM BAR-10 Bluetooth Audio Receiver (in conjunction with a bluetooth dongle if you need to add bluetooth to your laptop). I came across it from doing a Google search, and I don't have any experience with it.
If you're just wondering in general if you can connect something to a USB port and stream music wirelessly to your receiver, there are other options.
Just something to get the thread going. Hopefully others will have some good ideas for you.