PEOPLE in Barcelona had to do a double take when former President Barack Obama, Michelle Obama and film-maker Steven Spielberg joined the throngs of tourists to visit some of the city's main sites - albeit with added security. The trio were in Barcelona to attend a concert by pal Bruce Springsteen at Barcelona's Lluis Companys Olympic Stadium on Friday night. Obama, Spielberg and Springsteen dined at the Amar restaurant in the Palace Hotel on Thursday. Staff member Pol Perello uploaded a photo of them posing with wait staff and chefs to Instagram with the comment "the pleasure this job brings…