He's getting married next week ... but Backstreet Boy A.J. McLean has blood on his mind -- sending out death-themed invitations that look like they were designed by Ed Hardy and Dracula ... and we got pics.
A.J. and his GF Rochelle Karidis are set to tie the knot on December 17 -- presuming all his guests aren't completely freaked out by the invites ... which contain bloody lettering and creepy gothic imagery.
The ceremony will take place at the Beverly Hills Hotel -- and celeb photographer Tyler Shields is officiating.
Don't get your hopes up for pics though -- according to the invites, all cell phones and cameras are banned.