All of them have stopped working at the same time?
Unlikely to be the bulb unless there was some strange surge event or something from the alternator that popped them all at once. Does the car still run fine otherwise?
Sounds to me like either a fuse or a relay, cheap to replace but will take a bit of diagnosing and some basic electrical knowledge you can learn from youtube. Then when you do get them working again one of the bulbs will probably still be blown and that'll have been the one that f**ked it in the first place. Could also be a ground fault of some kind? (not too sure on that last one)
