?beard bar

Amid the super success of Breaking Dawn, Robert Pattinson seems to be letting fame go to his head ...

The actor, famously tied to co-star and real-life girlfriend Kristen Stewart, was out last night with another girl -- Sarah Roemer of the 2007 film Disturbia!

We spotted RPatz at the hip, Los Feliz bar La Poubelle, surrounded by admiring female fans.

A source inside the bar last night tells us:

    "Rob was literally fending off advances from girls, left and right. Every female in the bar wanted to get close to him and for the most part, he politely ignored them but one girl caught his eye and she left with him!"

The 27-year-old actress starred opposite Shia LaBeouf in the 2007 thriller. She was also in the films Locked Up, Waking Madison, and The Con Artist last year. Her TV credits include The Event and Hawaii Five-O. Roemer began her career as a model when she was discovered in her hometown of San Diego in 2000.

Could Pattinson and Stewart's long-time relationship be on the rocks??? Is Sarah Rob's new girlfriend???