The Piano star has been dating the actor since 2001 and Hunter gave birth to the couple's twin boys in 2006. Now it seems MacDonald has proposed.
During an appearance on America's The Late Late Show on Thursday (20May10), Hunter flashed a sparkling band on her wedding finger - prompting host Craig Ferguson to ask, "Do you have some news?"
Hunter replied, "Well, you know…" before Ferguson continued: "It's a bold statement right there."
The actress went coy, but added, "I know, isn't it, though? It's very bold, from a very confident man."