Tyler Cameron's still the ultimate bachelor ... he went to a friend's wedding over the weekend and had a helluva time, tearing up the dance floor and locking lips with his date.
TMZ obtained video of the 'Bachelorette' star making out with a mystery brunette at the Orlando, FL reception -- they're bumping, grinding, kissing and having a great time as a Bell Biv DeVoe classic played. And, no, Tyler doesn't seem at all worried about his date being "Poison."
Folks who were there tell us the woman wasn't someone Tyler picked up at the wedding -- she appeared to be his plus one, as they arrived together and left together.