Though she posed with heartthrob Robert Pattinson on the red carpet, Reese Witherspoon described her animal attraction to a different co-star at the London premiere of Water for Elephants. "At the very end of the film I got to hold a baby lion. It was amazing," Witherspoon (in Stella McCartney) remembered. "It was, like, clawing at my thigh!" In New York City, Beyonce got up early the morning after the Met Costume Institute Gala in order to join a group of students at PS 161 in Harlem for a dance class, while another dance-loving singer, Ciara, kicked up her heels at the Candie's Foundation "Event to Prevent." See all the photos from last night's hottest parties in the gallery!