Former US President Barack Obama is celebrating the opening of his presidential centre in Chicago with a star-studded guest list that includes Bruce Springsteen, Stevie Wonder, Christina Aguilera, Bono, and former Presidents Joe Biden, George W. Bush and Bill Clinton. ADVERTISEMENT ADVERTISEMENT The invite-only opening ceremony is taking place on Thursday, with Obama and former First Lady Michelle Obama expected to speak. The event is being livestreamed. Other celebrities slated to appear