Istock Composite

Taylor Swift and Travis Kelce 's wedding is still undoubtedly months away, but now that's it's a matter of "when" and not "if" ... gamblers can make a buck on it!!

The folks over at BetOnline.ag tell TMZ Sports , they're releasing some nuptial-themed betting odds now that Swift and Kelce are officially engaged . Gallery Launch Gallery

One of the more intriguing options centers around the couple's bridal party -- as in, who will nab Best Man and Maid of Honor titles??

Kelce's big brother Jason , of course, is the favorite (-5000) to be by the tight end's side at the altar. But there isn't much of a front-runner for Swift, as her close pals Abigail Anderson Lucier (+350), Martha Hunt (+400), Karlie Kloss (+500) and Selena Gomez (+500)

See Full Page