Nikki Reed Stuns in Plunging White Gown at Breaking Dawn Premiere

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It's the second show-stopping white gown she's worn this month, only this time Nikki Reed's look was anything but bridal.

The actress, 23, hit the red carpet at the 2011 Rome Film Festival on Sunday to promote The Twilight Saga: Breaking Dawn - Part 1 in white pleated dress with a super low-cut neckline and open back design by Maria Lucia Hohan. She accessorized with metallic shoes and simple gold jewelry.

For the Twilight star's October 16 nuptials to American Idol’s Paul McDonald, 27, she chose a Tacori gown with a 72-inch train.

"It was so feminine," she told Us Weekly.