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According to TMZ, the whole OMG-moment went down at Sel's mansion in Los Angeles sometime last week. She returned home from a trip, and noticed the front door was unlocked. She thought someone had entered her casa while she was away.
Of course, the cops took her call seriously and raced over to her place. They didn't find anyone or anything there.
We get why Selena is a little paranoid. She had to call the police several times earlier this year after the same stalker showed up at her house twice. You'd think by now she'd have a better security system?