According to the White House Historical Association, the first Christmas tree in the White House was placed in the Yellow Oval Room on second floor in 1889, during the Benjamin Harrison administration.
New this year are wreaths hanging from the exterior of every window.
The family Christmas card is framed and on display.
"We want to wish everybody a merry Christmas, a happy New Year, have unbelievable holidays, and we are now going to light a very attractive tree", said Trump.
The decorations continue a tradition that dates back decades.
The 350-pound (about 160-kilogram) gingerbread house this year offers a view of the White House from the south. The first lady unveiled the decorations at 1600 Pennsylvania Avenue on Monday, while welcoming children of military families to the residence. "Melania Trump tweeted, "@WhiteHouse is ready to celebrate! "That is what makes every Christmas merry". The theme for this year is "Time-Honored Traditions", and included in that is a lovely nativity scene.
And Mrs. Trump didn't have to do all the decorating by herself. The White House said Mrs Trump chose every detail of the decor and did a final check late Sunday after returning from the family's Thanksgiving at their estate in Palm Beach, Florida.
More than 25,000 visitors are expected to tour the White House for the holidays and the kitchen is ready: 31,000 cookies have been baked, including 15,000 sugar cookies, many of which end up in purses for the trip home.
One Twitter user pointed out that the dimly lit hallway lined with dead branches painted white looks like the ideal spot to tape a "Stranger Things" scene.