Shock rocker Marilyn Manson has prompted rumors he has proposed to girlfriend Evan Rachel Wood, after the actress was spotted with a ring on her engagement finger.

The 20-year-old flashed a sparkling gem on the New Jersey set of The Wrestler - 13 months after she began dating Manson, who is 19 years her senior.

The pair hooked up after Manson split from his ex-wife, burlesque star Dita Von Teese.

After going public with their relationship, Manson said, "I've found my double, my twin, with my new girlfriend, Evan Rachel Wood. She understands I like to get up when night falls and go to sleep at dawn."