Christie Brinkley's Ex Peter Cook Gets Engaged to 21-Year-Old Student

Christie Brinkley‘s ex-husband, Peter Cook, popped the question to another blonde bombshell … but this one’s just old enough to legally pop a cork.

Peter is now engaged to tie the knot with 21-year-old Alba Jancou. He dropped down to one knee and proposed to the college hottie last month outside a church in Santorini … according to the NY Post.

Peter’s been hanging out with Alba since at least this summer, showing her off at some fancy parties in the Hamptons. We know — age is just a number, but this is kinda wild.

Peter and Christie’s daughter, model Sailor Brinkley-Cook, is the same age as Alba … her new stepmom-to-be.

Alba is currently a student at Tulane University in New Orleans, and according to her social media, she’ll be graduating in 2021. As for the other important date in her life — no word on when the happy couple’s planning to walk down the aisle.

BTW … the age gap is the same as Dennis Quaid and his fiancee, Laura Savoie, who got engaged earlier this month in Hawaii.