Jada Pinkett Smith -- You'll NEVER Guess My Valentine ...

V-Day is just around the corner -- and with all the rumors about marriage troubles for Will Smith and Jada Pinkett-Smith ... there's one question on everyone's mind ... WHO is Jada's Valentine this year?

The answer might surprise you.

TMZ broke the story ... Will and Jada had bounced back from a rough patch last summer, when reports circulated that the couple was separating. So, still going strong for Feb. 14?