I think because she's on that new show, The Voice, that her schedule is really crazy right now and so they're trotting out lots of extras/clones so she can make all those contractually required public appearances in addition to doing her TV show. I think so many times it's about "stunt doubles" who can fill in at the usual autograph signing types of gigs while the "real" or "main" person does the big show or big gig.
That magazine cover you posted in the post before this one - what the heck? They found a woman with an aquiline nose and reptilian eyes and a completely different look and presented her as Christina/Fhristina. Not even close to looking like the other ones. Bizarro!