The billionaire founder of the Blue Origin space company has worked to charm Donald Trump in recent months, and even invited the president to his lavish, star-studded wedding in Venice, White House officials told The Wall Street Journal. The president apparently isn’t planning to attend, due to scheduling conflicts.

Oprah Winfrey, Kim and Khloe Kardashian, Tom Brady, Bill Gates and Leonardo Di Caprio are among the many already gathered in Venice for the lavish celebrations.

Amazon founder Jeff Bezos and former journalist Lauren Sanchez are set to tie the knot in Italy this week, even as local frustrations mount over the multi-million dollar event. Here's what to know about the three-day wedding celebration,