Instagram/James Hetfield & Adriana Celebrity Metallica's James Hetfield proposes underwater! See the rockstar's scuba gear proposal to Adriana Gillett and her joyful thumbs-up acceptance. March 17, 2026 AceShowbiz - James Hetfield, the lead singer and guitarist of Metallica, created a memorable moment last week by proposing to his girlfriend, Adriana Gillett, during a scuba diving trip. On Friday, March 13, Hetfield, 62, shared a photo from the underwater proposal on Metallica's official Instagram account.