Adding to the comment of Jack - The Title of the Set ist also called "Presenting Greta" NOT "Presenting Ksenya". So the adding of the alias "Greta B" would make sense.
regarding the cover for 1 May 2011: even though metmodels calls her ksenya a on their site, the cover says 'greta b'. Maybe for search purposes it's good to add greta b to the aliases?