Most fans are thrilled if they can get a photo with one of their favorite celebrities, but a teenager who uses the pseudonym "Stalker Sarah" has nearly 5,000 pics with the world's biggest names!

The 16-year-old from Los Angeles has snapped photos over the last four years with everyone ranging from Brad Pitt to Kim Kardashian to Oprah Winfrey and posts them on her Twitter account, according to Daily Mail. She said that she's become such a regular presence at red carpet events that A-listers like Justin Bieber even know her by name! Talk about determination!

"Stalker Sarah" with Kim Kardashian

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Sarah said that she has always had an interest in pop culture and that her father has supported her picture-taking habits on one condition. "As long as I got straight A's in school, he would take me to every event he possibly could," she said in an interview with Good Morning America. "I got straight A's and he had to keep that deal."

She also said that Justin and Katy Perry were among the "nicest" celebrities in obliging her requests. But while there are a few celebs like Britney Spears that Sarah hasn't had the chance to take a picture with, she only asks for photo-ops under the right circumstances. "I always know the right situation," she said. "So normally if I don't think it's going to be good for them, if I don't think they look right or I don't think they're going to want to take a picture, I just don't ask."

What do you think of Stalker Sarah's hobby?

Photos courtesy of http://twitter.com/sarahmonline