Ann Oldenburg, USA TODAY
The white smoke signaling a new pope was causing excitement in Rome, around the world and, of course, on Twitter.
Here's what some stars had to say about it:
Seth Rogen ?@Sethrogen: "There's also white smoke coming out of my office, but nobody seems that excited about it. #pope"
Joan Rivers ?@Joan_Rivers: "A new Pope has been chosen! I haven't seen this many people transfixed by a puff of white smoke since the discovery of fire!"
Downton Abbey's Dowager Countess, @theLadyGrantham: "White smoke rising from the #Vatican. Either a new pope has been elected, or Thomas and O'Brien are sharing a cigarette out back."
Jim Gaffigan ?@JimGaffigan: "Any truth to the rumor I'm starting that the new pope will also replace @JoyBehar on The View. I'm not saying it's me but I do have a Pope acceptance speech ready."
Aziz Ansari ?@azizansari: "Feeling good about my chances to be new Pope. My agents said I should hear something today..."
Neil Patrick Harris ?@ActuallyNPH: "New Pope news soon! You might want to follow @TheTweetOfGod for all papal updates. He has an "in"."
Maria Shriver @mariashriver: "Big moment for the church and for those of us who call ourselves Catholics. I hope the new pope comes with an open heart and open mind."
Ellen DeGeneres @TheEllenShow: "The good thing about being sick is I don't have to miss one minute of #PopeWatch2013. Back to the Chimney Cam."
Chris Harrison, @chrisbharrison: "When I told @SeanLowe09 & @clmgiudici I'm ordained I never thought the Vatican would respond so fast #Whitesmoke"
ArsenioHall, @ArsenioHall: "#CNN News just announced that @michaelstrahan will be replacing The Pope! Congratz Bruh!!! #whitesmoke"