The X-Men star and his fiancée are apparently planning to tie the knot later this month, according to Us Weekly.
Ashmore and Wasdin have actually been engaged for some time, but only chose to publicly reveal the news in recent days.
The couple met when Wasdin served as an assistant director on Ashmore's 2010 film Frozen.
Ashmore is perhaps most famous for playing Bobby Drake/Iceman in the first three X-Men feature films.
He has also appeared in Animorphs, The Ruins and the television series Fringe.
Watch a trailer for X-Men: The Last Stand below: