The Wynns hit Trump's club; Wynn's club rocks with The Chainsmokers, Usher

Steve and Elaine Wynn hit President Trump's Mar-A-Lago resort on NYE. Wynn was once a Trump rival. Now he is a power player in the Republican Party. Meantime, The Chainsmokers invited Usher on stage at Wynn's XS Nightclub. Usher's performance of "Confessions" was unbilled and thrilled the crowd. Celine Dion was among the Strip headliners to perform on national TV on NYE. EDM superstar Tiesto has signed through 2020 with Hakkasan . Bruno Mars hit The Bank Nightclub on NYE after headlining The Park Theater. Pia Zadora welcomed celebs Charles Barkley, Ed "Too Tall" Jones and Nicolas Cage to her show at Piero's. Owner Freddie Glusman, of course, was also on the scene.