As of Sunday, June 11 night, the White House has two new occupants: US First Lady Melania Trump and her son Barron have finally moved in to 1600 Pennsylvania Avenue, AFP reports.

Six months after President Donald Trump arrived, the Slovenia-born former model and the couple's 11-year-old son joined him, an aide to the First Lady told AFP.

The pair had previously stayed in New York so that Barron could complete the school year. He is expected to attend St. Andrews Episcopal school, just outside Washington, in the 2017-2018 session.

Before reaching the capital Melania and Barron descended the steps of Air Force One alongside President Trump at Joint Base Andrews, with the youngster -- decked in a tee-shirt that read 'The Expert' -- playing with a fidget spinner.

Melania's parents had joined them for the short flight from Bedminster, New Jersey, where Trump had spent the weekend at his golf course.

After arriving at the White House Melania tweeted a picture from a window looking on to the South Lawn and the Washington Monument.

"Looking forward to the memories we'll make in our new home! #Movingday" she wrote.