EXCLUSIVE

DeMarco Murray became the MVP to 3 brothers Tuesday night -- when he found out their house burned down in a fire ... and surprised them with autographed jerseys and a night they'll never forget.

We've learned ... Murray recently learned about the story of the Livermore family -- who "lost everything" when their home in Frisco, TX burned down in December.

Murray happened to be in Texas Tuesday night for a Hublot watches event -- and decided he wanted to do something nice for the family's 3 kids ... who lost their treasured DeMarco Murray memorabilia in the blaze.

So, here's what Murray did ... he had Hublot contact the family and invite them to the event -- unaware that DeMarco was planning a surprise.

When they arrived, DM personally greeted them at their car -- and the kids freaked out! It gets better ... Murray then handed the kids autographed Cowboys jerseys to restart their collection.

Plus, they all got free watches from Hublot's limited edition Dallas Cowboys series.

How 'bout them Cowboys?!