NYClout lists this as open, with a 2 hour open bar, with Jessie J most likely being there too.
YRB Magazine Issue Release Party Hosted by Jessie J Party
Rdv, 409 WEST 13TH STREET, New York, NY
Music By: DJ Mos
Crowd: Trendy | Mainstream
Dresscode: Casual but neat
Open bar: 7pm-9pm