Det finns inte mycket information om hur bröllopet utfördes i böckerna:

"I took her castle and she took my heart." Robb smiled. "The Crag was weakly garrisoned, so we took it by storm one night. Black Walder and the Smalljon led scaling parties over the walls, while I broke the main gate with a ram. I took an arrow in the arm just before Ser Rolph yielded us the castle. It seemed nothing at first, but it festered. Jeyne had me taken to her own bed, and she nursed me until the fever passed. And she was with me when the Greatjon brought me the news of . . . of Winterfell. Bran and Rickon." He seemed to have trouble saying his brothers' names. "That night, she . . . she comforted me, Mother."

Catelyn did not need to be told what sort of comfort Jeyne Westerling had offered her son. "And you wed her the next day."

He looked her in the eyes, proud and miserable all at once. "It was the only honorable thing to do. She's gentle and sweet, Mother, she will make me a good wife."
Catelyn II, a Storm of Swords

Inte mycket mer än det som sägs om det. Samma information som @TheLethalCarrot ger stillbilder, det finns inte många Weirdwoods i söderna, så troligen tog de den första septon som de kunde hitta och rullade med.

En annan sak att notera är att Jeyne Westerling, i motsats till Talisa, var från de sju kungarikena och håller sig till de sju troen. Så det är mer meningsfullt eftersom de båda upptogs (delvis) med den troen.

Jeyne vs Talisa

Detta är en av de få subtila (ahem) skillnaderna mellan showen och böckerna. Skådespelarna på showen ändrade karaktären Jeyne så mycket att George R. Martin frågade dem att byta namn, för att undvika förvirring:

57 minutes: He talked about how he suggested that the name of the character Robb married in Season 2 be changed to Talisa, given that this was an entirely new character that book readers would not be familiar with (in the novels, Robb's love interest has a different name and history).
'Game of Thrones' Season 3 Characters And Scoop From Creator George R.R. Martin