Howard popped the question to Zulay Henao, a Colombian actress whom he has been seeing since 2005.
The Iron Man star was in Prague, in the Czech Republic, where he is filming the movie, Red Tails, and received a visit from his girlfriend.
Last Friday (May 22), the 40-year-old star simply said to WENN, "I just got engaged."
The relationship between the future married couple began after Howard’s second separation from his wife, Lori McCommas. However, it has never been officially confirmed by Howard, who prefers to remain discreet about his private life.