Jopling, 51, was married to Fifty Shades of Grey director Taylor-Johnson for 11 years until 2008 and they have two children together.
After the split, he enjoyed a short romance with British singer Allen in 2009, and now he is set to walk down the aisle once more after recently proposing to American art curator Hikari Yokoyama, who is 20 years his junior.
Yokoyama tells Britain's Daily Mail newspaper, "We are aiming for a wedding next year... I don't think we will have the wedding in England, just because you can't guarantee sunshine and I don't want to risk my beautiful bridal dress being rained on."
Taylor-Johnson has since married Kick-Ass actor Aaron Taylor-Johnson and they have two children.