Nikki Sixx and Courtney Bingham: Engaged!

Nikki Sixx and Courtney Bingham are engaged to be married!

After two years of dating, the Motley Crue bassist, 53, proposed to the model, 27, during a vacation to St. Barth's this past weekend. Here's a photo of them:

The stunning diamond ring he gave her is reportedly 6 carats. Baller.

This will be Nikki's Sixxth trip down the aisle. Kidding. Only his third.

He was previously married to Playboy Playmate Brandi Brandt from 1989-1996. He then married Donna D'Errico from 1996-2007; he has four kids between them.

Sixx was also in a relationship with Kat Von D at one point.

Here's wishing the couple nothing but the best!