Katy Perry shares a laugh with a fellow guest at the Vanity Fair/Bloomberg after party (Andrew Harrer / Bloomberg)

— Katy Perry brunching at Blue Duck Tavern Sunday. Low-key meal with just her agent the morning (okay, afternoon) after White House Correspondents’ dinner festivities. Resurfaced in Logan Circle that night for a late dinner at Le Diplomate. We kept just missing the pop star at the big dinner, though she was apparently hard to miss. (“Katy Perry bumped into me and almost had a wardrobe malfunction,” a national-security writer told us of the star’s stunning celery-green straining-to-the-bursting-point gown. “Anything could have set it off.”) Updated 5 p.m.

More Hey, isn’t that . . .? and even more sightings. . . Had a sighting? Share it at reliablesource@washpost.com.


The best of “The Grid” coverage of WHCD

Live coverage of the 2013 White House Correspondents’ Dinner

Full party coverage on The Reliable Source