The White House Correspondents’ Dinner is known as the “Nerd Prom,” but all the cool kids were at the party in Washington on Saturday night. Brookline legend Conan O’Brien hosted the affair and kept reporters and A-listers laughing with jokes about Bob Woodward , Vice President Joe Biden , and CNN’s reporting mistakes. On a more serious note, O’Brien also thanked President Barack Obama for visiting Boston after the Marathon bombings. The late-night comedian added, “If you’re going to pick a city to mess with, don’t choose one where nine out of 10 people are related to a cop.” The only person funnier than O’Brien during the night was Obama, who riffed on the controversy surrounding first lady Michelle Obama ’s bangs, his pal Jay-Z ’s recent, controversial trip to Cuba (the president joked, “I’ve got 99 problems and now Jay-Z’s one), and the budget sequester (his quip: “It’s like we’re trapped in a Taylor Swift album”). Obama did give a shout-out to print media during his speech, specifically to The Boston Globe for its coverage of the Marathon tragedy. Obama said, “If anyone wonders, for example, whether newspapers are a thing of the past, all you needed to do was to pick up or log on to papers like The Boston Globe. When their communities and the wider world needed them most, they were there making sense of events that might at first blush seem beyond our comprehension.” Celebs who were in the audience to hear the praise included Bradley Cooper , who’s on a break from filming the Boston movie “American Hustle”; Burlington’s Amy Poehler , who hung with former Boston resident John Legend and his fiancee, Chrissy Teigen ; Pittsfield’s Elizabeth Banks ; Julia Louis-Dreyfus ; Katy Perry ; and the Globe’s guests for the night, Boston native Leonard Nimoy and MIT president Rafael Reif . Our Washington correspondents tell us that Nimoy and Reif got along well and that they discovered during the dinner that they both speak Yiddish.