Sandy Springs police say 23-year-old Qianying Zhao of nearby Doraville was discovered at 5 p.m. on Wednesday.
Qianying Zhao told officers she was there to go to Justin Bieber’s birthday party and got in through an unlocked door.
The home, which is owned by music producer Dallas Austin, was unoccupied at the time.
Police say the party was held somewhere else, earlier in the week.
Qianying Zhao told officers she was Justin Bieber’s friend, police added, but investigators believe she’s one of millions of fans who follow him on Twitter.
She faces a charge of criminal trespass.
This week police have also released a video showing Justin Bieber urinating.
He was giving a sample for a drug test following his arrest by police in Miami Beach on January 23 on a charge of driving under the influence.
Justin Bieber, 20, is back in Miami for a legal deposition unrelated to his January arrest.
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