Leighton Meester Wows In Oscar De La Renta: How to dress a meringue? Leighton Meester looked worthy princess as she was spotted filming the final scenes of Gossip Girl in New York! The star wore a pink frou frou dress by Oscar De La Renta while shooting on the steps of the Metropolitan Museum. We can not work on what we prefer to dress, that number rose or ivory Vera Wang dress she wore at her wedding in November runaway? We would be happy with either!