Kennedy, 63, wore a charcoal check suit with a white shirt and a patterned tie.
The attorney and environmental activist resigned March 10 from Riverkeepers, a Hudson River nonprofit with which he had been involved for 30 years.
In the first-ever biography of Bobby - a powerful environmental lawyer and activist named one of Time magazine's 'Heroes for the Planet' - New York Times bestselling author Jerry Oppenheimer has put the namesake of Senator Robert Kennedy under a journalistic microscope. Bobby and his mother Ethel battled constantly and Ethel would beat her eldest son with a hairbrush Heart throb: When Bobby matriculated at Harvard, he was 'a gorgeous animal' and viewed as a 'babe magnet' from his first day of classes.
The state of their marriage has been the subject of tabloid speculation recently. Kennedy put on a loving display at the premiere of the actress's new film Wilson.
The couple, who wed in 2014, posed for photos with their arms around each other and smiled and laughed as photographers clicked away at the event held in NYC.
Bobby's daughters Kick, 26, and Kyra,18, were bridesmaids, as was Cheryl's 10-year-old daughter Catherine, while Bobby's sons, Robert, 29, Conor, 20, Finn, 16, and Aiden, 13, were his groomsmen.
This is perhaps a nod to the past few years which have seen Cheryl stand by Bobby's side following the devastating suicide of his second wife Mary Richardson Kennedy - the mother of four of his children - in May 2012.