"I have walked a lot of red carpets but tonight I was so nervous I thought I was going to fall on my face," she told reporters at Grauman's Chinese Theater as Lachey often petted her bare back, USA Today reports.
Playing the movie's sex symbol Daisy Duke, Simpson wears a skimpy costume, and early trade reviews of the movie – critical reaction is mixed – note that her role is similarly brief.
Variety says the movie "simply juggles and updates elements from the (TV) program that made its debut in the 1970s, serving up impressive stunt work, Jessica Simpson squeezed into Catherine Bach's Daisy Duke shorts (its own kind of special effect) and one big-city road trip to Atlanta."
As for Simpson, the trade paper reports that she "and her attire make equally brief appearances. More of her actual performance might turn up on DVD, but the bits that make it into the theatrical version play like outtakes from her more entertaining 'These Boots Are Made for Walkin'' video."
On the subject of that mid-'60s hit for Nancy Sinatra, which Simpson and Dukes costar Willie Nelson deliver on the movie's soundtrack, Simpson tells MTV that she so enjoyed her duet with the country legend that she hopes to work again with Nelson.
"We've been talking about it, Willie and I," Simpson says. "We have some songs put away for each other, but I don't know what we're going to end up doing. We'll see."