Nikki Sixx is getting hitched again. The Mötley Crüe rocker popped the question to gal pal Courtney Bingham over Thanksgiving weekend. On his Premiere Radio Networks show, “Sixx Sense,” the bassist said of his impending third marriage, “Yes, I put a ring on it . . . I never thought I would get married again. It was just something that I didn’t think was in the cards for me . . . and this girl changed my mind.” Busy Sixx’s book, “The Heroin Diaries,” is being developed as a Broadway musical.