"I did work at Christie's for a couple of weeks, getting ready for The Devil Wears Prada, getting people coffee and doing whatever they needed around the office," Hathaway said, referring to the world-renowned art auction house. "It was amazing. I got to see some wonderful art and everybody was really nice. It was great."
In The Intern, De Niro plays 70-year-old Ben Whittaker, who finds out that retirement isn't everything he'd hoped for, so he gets back into the professional world by seizing a senior intern position at an online fashion site, founded and run by Jules Ostin (Hathaway).
Co-stars Andrew Rannells and Adam Levine also had former internships to dish about to ET.
"I had an internship in college at a talent agency that was pretty hideous," Rannells recalled. "Not my favorite time of my life. They were pretty mean. I had to fax headshots, so that's dating myself."