Credit: CAD/Fame Pictures

Since announcing her engagement to Eric Johnson in November, Jessica Simpson has been hitting the gym extra hard. But the feisty starlet, 30, insists she's not following some crazy shedding for the wedding routine.

"Yes, I am working out, but why is that worth any sorta press? I always take care of myself," she wrote on her Twitter page Thursday, adding, "Eric and I could get married right now in sweats!" See more photos of Jessica's pre-wedding workout.

Somehow we doubt the designer, whose fashion empire is estimated to be worth close to $1 billion, would take the aisle walk looking less than perfect.

But that might not rule out an in-the-buff ceremony, at least where Johnson is concerned.

Last month, Simpson tweeted about her fiancé's athletic physique. "Saying my prayers before bedtime...Thank you Lord for blessing me with a Man that has the perfect tush. Laying my hands upon it with peace :)"