• Rob Lowe dining at Bourbon Steak at the Four Seasons Saturday night. Black shirt, black pants, blindingly handsome — but you knew that. His large, lively group took a table in the back but fans still found him and wandered over to get their photos with him. Unclear what brought him back to town or if he’s still hoping to get that D.C.-reality show, “Potomac Fever,” off the ground.
• Joe Biden treating a couple of his granddaughters at Pete’s Apizza in Columbia Heights Friday night. Jacket, no tie. Crowds hovered outside the window to take pics.
●• Edward Gero taking in the Rothko room at the Phillips Collection Friday morning. Hardly a first for the actor, who spent hours there in preparation for his role as Mark Rothko in Arena Stage’s “Red” — but this time he brought along Patrick Andrews, who plays the artist’s assistant.