Justin Bieber's wedding is ticking off a lot of hotel guests

JUSTIN and HAILEY BIEBER are having an actual wedding ceremony at the Montage Palmetto Bluff hotel in South Carolina today . . . and some hotel guests aren't happy about it.

Apparently, the Montage sent out an email informing them that they can't use the spa, the pool, or the fancy restaurant on the grounds for 48 hours because of the wedding.

These areas became off-limits yesterday at noon, and will stay that way until noon tomorrow. Guests have been offered refunds, alternate bookings, and upgrades to make up for it.

Justin and Hailey hopped on a private plane on Saturday . . .and they had a rehearsal dinner last night.