25 Celebs Who Married Young Jamie Lynn Spears will join the under-25 group By Evann Gastaldo, Newser Staff Posted Mar 9, 2013 11:05 AM CST 5 comments Comments Melanie Griffith arrives at the taping of the American Film Institute Life Achievement Awards honoring actor Michael Douglas in Culver City, Calif., in 2009. (AP Photo/Matt Sayles) (Newser) – Jamie Lynn Spears, engaged at just 21, joins a whole host of young brides in Hollywood. The Huffington Post rounds up 25 under 25: Megan Fox married Brian Austin Green when she was 24. Hilary Duff wed Mike Comrie at age 22. Heidi Montag was 22 when she married Spencer Pratt. Elizabeth Taylor's first marriage, to Conrad Hilton, took place when she was 18. Mandy Moore married Ryan Adams when she was 24. Melanie Griffith wed Don Johnson when she was 18. Dolly Parton was 20 when she married Carl Dean. Click for the complete list of marriages, most of which, shockingly, didn't work out.