Kristaps Porzingis is already getting love in his new town ... 'cause Emmitt Smith is welcoming him to Dallas with open arms ... telling TMZ Sports he's stoked for the blockbuster trade!!
K.P. -- along with Trey Burke, Courtney Lee and Tim Hardaway Jr. -- was just traded to the Mavericks in exchange for DeAndre Jordan, Dennis Smith Jr. and Wesley Matthews on Thursday.
We broke the news to the Cowboys legend at the EA Sports Madden Bowl .