PIC: The-Dream's PDA ... Not With New Wife Christina Milian

Caught in the act!

UsMagazine.com can confirm the woman married producer The-Dream frolicked with in the Carribean over the weekend is his assistant of about a year, Melissa Santiago.

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The-Dream (real name: Terius Nash) married singer Christina Milian last September, and welcomed daughter Violet just five months ago.

PHOTO: The first pic of Christina and Violet

In one photo, The-Dream, who is not wearing his wedding band, is straddled by Santiago. In another, he's grabbing her booty while she wraps his arms around him.

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Her rep had no comment. The-Dream's rep did not respond for comment.