The Jonas Brothers have announced plans to perform a free concert in New York Thursday night.

The fraternal pop group's surprise gig at Manhattan's Irving Plaza club was announced Thursday afternoon on the New York radio stations Z-100 and WPLJ.

The first 700 people who register, starting at 4 p.m. ET, are to be admitted to the free concert.

Doors are to open at 8 p.m. and the show is set to start at 9 p.m. ET.