Singer Estelle and designer Jonathan Kelsey collaborated on "The Belvie" -- a bag designed specifically for the launch of Belvedere's Black Raspberry vodka flavor that they will unveil on April 29 at 117 Mercer St. VIP guests like Charlotte Ronson, Phillip Lim, Waris Ahluwalia, Peter Som, Helena Christensen, and Lizzie Jagger will attend and sample the new spirit and cocktails mixed by Belvedere's Master Mixologist Claire Smith. Want to get in on the fun? On Saturday, May 2, Belvedere Vodka will open the doors of its pop-up store to celebrate the launch with the public. From 1 p.m. to 7 p.m., guests will undergo a 360-degree Black Raspberry experience via flat screen TVs and discover what Maceration, Belvedere's natural method of flavoring vodka, is really all about.