"It won't be a summer wedding. I won't be a sweaty bride," says Hewitt, 28, who announced her engagement to Scottish actor Ross McCall in November.
"We are still planning the wedding and haven't set a date yet. But it'll still be small and intimate," she said Saturday while attending the Evening of Hope benefiting the American Cancer Society.
In addition to the right temperature, the two are waiting for their schedules to "simmer down" a bit, too. Hewitt's Ghost Whisperer is currently in its third season.