Newly elected President Donald Trump and his wife, Melania Trump, welcomed the New Year at their Mar-a-Lago estate, hosting a lavish party attended by prominent guests, including Elon Musk.

The world’s richest man arrived at the celebration accompanied by his youngest son, X AE A-XII.

Several attendees shared videos and photos from the star-studded event, capturing moments of Elon Musk dancing throughout the evening with his son and Donald Trump. At one point, Musk and Trump were seen performing Trump’s signature dance moves to the 1978 hit “Y.M.C.A.”

Trump’s daughter-in-law, Lara Trump, also took the stage at one point to sing a few songs, including Tom Petty and the Heartbreakers’ “I Won’t Back Down.”