Jessica Biel red carpet dress backless hitchcock

Isn't she gorgeous? Justin Timberlake sure is a lucky guy!

Jessica Biel posed for photos at the Hollywood premiere of Hitchcock on Tuesday night, and the 30-year-old actress showed off her hot bod (and a peek of side boob!) in a long black Gucci dress. This is certainly a nice change from the ridiculous pantsuit she wore at the film's New York premiere!

In addition to her picture perfect manicure, Jess gave us yet another peek at her stunning engagement ring from JT ... click thru for a closer look!