Though Alessandra Ambrosio and entrepreneur Jamie Mazur aren't technically married, they've been together long enough to earn a place on this list. According to Vogue , they've been engaged since 2008 — though you wouldn't know it, considering the model lost her engagement ring. So why exactly have they taken so long to tie the knot? Ambrosio blames her busy career for eating up all her time. She told Mario Lopez during a 2015 interview that she spends so much time preparing for fashion shows, and wants her wedding to be "very special" so she wants to wait until she has the time.