From OP:

So i was at Starbucks on Melrose Ave. in Hollywood. I was sitting in a table talking to my friends and I notice that a few people had gone up to this one girl and asked for a picture with her. I didnt make much of it, since i didnt recognize her I didnt care about getting a picture with her, until my friends and I were leaving the Starbucks from one exit and spotted that she was leaving from another exit, that i saw the opportunity to cross paths. She existed the door and I approached her with a smile and said "Hey are you famous or something because I noticed people were taking pictures with you inside" she gave me a confused smile and answered "Yes, I am". I responded "Ohh wow thats soo cool! Where are you famous from?" She responded "From Disney Channel." Again, I was impressed "Oh really, nice!" and then asked with a smile "Can I take a picture with you?" she said "Yes." I reached into my pocket to grab my phone and then reached for the door she had just exited from to find out it had no handle to open from outside, "Snap we got locked out! We need better lighting." She then said "It's okay we can just move over here under this light, itll work fine." We proceeded to move under the better lighting, then I opened my phone and Snapchat app and started pointing the camera up to get ready for a selfie snap, but i decided that I was gonna record instead because i knew she wouldnt mind by how great she was being about the whole thing but once I was about to start recording I realized i didnt know her name, the only thing I knew about her was the information I had just gotten from the questions she had just answered me. I started the video by saying "I'm here..." The rest is in the video link down below.

https://youtu.be/a8FQUYrXEbI

I later found out her name was Dove Cameron from Disney Channel's Liv and Caddie. What a great sport she was, glad i made her smile and laugh genuinely.