The 51-year-old actor was previously married to Jessica Sheppard, with whom he has two children, Will and Max Sheppard. Sarah also took to Twitter to clear the air, saying, "Mark & I are engaged. His children are **t from me but I love them hugely! hope this clears up any lasting confusion there still seems to be." Keep reading for a**ther look at the jaw-dropping ring, and then ogle the most massive celebrity engagement rings and check out 15 engaged Hollywood couples we can't wait to see tie the k**t.