Reese Witherspoon dropped into Serafina, at the Time Hotel on West 49th Street, during the intermission of “The Book of Mormon” the other day. Spies said the smiling actress, wearing black, “drank pinot noir at the bar during the break.” She was joined by a friend, a bodyguard and a driver. Our witness added, “She was really chatty with the bartender, and she said hello to the other staff. She loved the [musical]. She was friendly, bubbly and made a good impression on everyone.”