"I like it all, so maybe [I'll have] multiple dresses," Upton shared. "Maybe a nice long sleeve, and then also the big tulle one."
Regardless of which dress she chooses, though, the gown is sure to have a sexy twist.
"I think that I always like to add a little flair of sexuality to any outfit I'm wearing," she revealed, adding that she's not worried about shocking any grandparents in the room. "My grandparents get Sports Illustrated...they've seen it."
Upton got engaged to Detriot Tigers pitcher Justin Verlander early last year, debuting her stunning reported $1 million engagement ring at last May's Met Gala.
"I was completely surprised," Upton gushed. "There was this moment before he proposed, I was like, 'Is he? No,' and I just kept enjoying dinner."
Verlander definitely played his cards right. The 34-year-old baseball star collaborated with jeweler Anita Ko on a one-of-a-kind ring for Upton.
"He did amazing. He knew that I would be wearing it every single day, so he did all of this research behind the ring, and he almost had like a mood board set out that he was looking at and what he thought I would like," she said, adding that Verlander also put quite a bit of thought into his proposal.
"He did [ask my parents], but he doesn't trust my parents with secrets because they told me once what he was getting me for my birthday, so he only told them two days before he asked me," she confessed. "They kept it quiet."
Though the 24-year-old model is keeping her wedding date under wraps, there's a few details she doesn't mind sharing.
"There's definitely going to be tequila and good food at the wedding," Upton said. "I guess [I'm having] a big bridal party. My sisters are co-maid of honors."
"[We're] planning towards a destination wedding," she continued. "We don't really get the opportunity to go on a lot of vacations together because of how long baseball season is, and how busy we both are, so I think that what we want for our wedding [is to] have all of our closest friends and families go on an extended vacation together."
Also on Upton's wedding to-do list? Making Verlander tear up as she walks down the aisle.
"I hope he cries during the wedding day," she admitted. "I think it's going to come."