Instructions
Turn on your PlayStation 3 wireless Bluetooth headset. Scroll to the Settings section of the main PlayStation 3 XMB menu and select "Accessory Settings."
Select "Audio Device Settings" and highlight the "Input Device" option. Press the "X" button to expand the Audio Device Listing.
Scroll to the "Wireless Headset" option and press the "X" button. Highlight "OK" and press the "X" button. Press the "Circle" button to return to the PlayStation 3 main menu.
Scroll to the PlayStation Network section of the main menu and select "Sign In."
Launch "LittleBigPlanet" and your Sackboy avatar's mouth will move whenever you speak into the wireless Bluetooth headset.