She was portrayed by Lindsey Broad.
Melanie91 has brown hair and brown eyes and looks to be older than the main characters and seems to be in extremely late teenage years or early twenties. She is credited as "Girl Who Takes Photo of Serena". She tips off Gossip Girl and sends her a picture informing her (and eventually everyone) of Serena's return to Upper East Side.
Gossip Girl speculation
Fans speculate on the IMDb forums that melanie91 may be Gossip Girl
- Pilot (first and, currently, only appearance)