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"I don't really make a lot of (wedding) decisions," Cutler, 28, told ESPN's Waddle & Silvy on their radio show Wednesday.
"I hear about them in passing or if I have to possibly write a check or something like that," he added, "but other than that, whatever she wants to do, I'm on board."
He's so hands-off, in fact, that he couldn't even tell the hosts the planned date or location of the ceremony!
"You're asking the wrong person," joked Cutler. "(I'm) just kind of along for the ride."
Cutler proposed to Cavallari, 30, on a Mexican vacation in April, after they had been dating for seven months. The pair called off the engagement just three months later, when Cutler reportedly dumped Cavallari. But when Cavallari started appearing on Dancing with the Stars this September, Cutler showed up in the audience to support her -- and soon, the romance was re-kindled.
"They're happy together," says the source. "They just now understand each other a lot better. He understands what she needs and she totally supports him. They're there for each other."
Plus, while they were broken up, Kristin got lots of practice for their first dance!