Stay calm. Or don't. But definitely plan to take your lunch break a little late today.

Stevie Wonder is coming to Dilworth Park (1 S. 15th St.) this afternoon for a free, surprise concert at 3 p.m.

Touting the fall leg of his Songs In The Key of Life Tour, which will mark the final live U.S. tour performances, the Grammy winner will perform two to three songs, announce a Philadelphia tour date, and take questions.

Songs In The Key of Life Tour will make another Philly stop at the Wells Fargo Center on Wednesday, Oct. 7 - his second time back to the city in a year. Tickets will go on sale at 10 a.m. on Friday, Aug. 21.

Dubbed #AWonderMoment, the pop-up show was alluded to on Sunday evening courtesy a tweet from Live Nation.

Philly will be the second of three pop-up performances today bookended by a stop at the Armory Mall in Washington, D.C. this morning and an evening appearance at the Central Park SummerStage in New York City.