ASHLEE SIMPSON will be a blushing bride in just days! Sources tell ET that JESSICA SIMPSON's little sis will wed PETE WENTZ Saturday, May 17 at a private home in Los Angeles. About 120 guests are expected to attend the affair, which will be kept private under fashionable tents! Ashlee, 23, and her FALL OUT BOY beau, 28, have been romantically linked since fall of 2006.