updated 04/18/2011 AT 3:00 PM ET
•originally published 04/19/2011 AT 5:00 PM ET
“The countdown’s begun,” Lachey, 37, told PEOPLE Saturday at a Hollywood event for The Matt Leinart Foundation. “You know, the clock is ticking, so we’re getting dangerously close. That’s all I can say.”
His bride-to-be said recently she likes the idea of a winter-themed wedding, but Lachey won’t succumb to pressure on revealing further details.
Still, the groom does admit to a little (understandable) vanity about the big day.