Diane Lane presents the Nora Ephron Prize during Awards Night at the Tribeca Film Festival. (Nicholas Hunt/Getty Images for Tribeca Film Festival)

Hey, isn’t that … Actress Diane Lane, going incognito this weekend in Washington at the People’s Climate March?

Leonardo DiCaprio might have been the protest’s poster celeb, but it seems the “Under the Tuscan Sun” star is worried about climate change, too. Her presence might have gone unnoticed, but tipsters spotted the Oscar nominee twice at Arroz, the new Mike Isabella-owned Spanish/Moroccan restaurant in the Marriott Marquis.

The denim-clad Lane, who is set to reprise her role as Superman’s mom in the upcoming “Justice League,” was first seen at the bar on Friday night gabbing with the bartender. She was back again the next night, a spy says, this time with a pal, for wine and a few plates. The pair apparently liked their meal and asked to meet chef Michael Rafidi, who came out of the kitchen to greet them.

That prompted us to check social-media evidence of Lane’s visit, and the Moms Clean Air Force had posted a pic of a group of protesters from the Saturday march that included Lane, blending into the crowd by looking more mom-chic than Hollywood goddess sporting aviator glasses and a backpack.