He popped the question while in Paris.
Tom who is in the capital to promote his new film War of the Worlds told a press conference: "Yes, I proposed to her. It was early this morning at the Eiffel Tower, so I haven't slept at all.
"Today is a magnificent day for me, I'm engaged to a magnificent woman," he added.
Holmes, who accompained Cruise at the conference, was wearing a large ring.
They have been dating since April reports BBC online.
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