“She was so kind and warm and welcoming and she was so enthusiastic about the show,” Collins said. "Having her on set was so fun, she improv-ed, we had such a great time together ... It was an honor to do that with her.”
The First Lady plays herself in one of the new season's episodes.
The first half of Season 4 came out on Netflix on Aug. 15.
The cast all headed to Rome this week to premiere the new episodes, some of which are set in Rome.