Robert Pattinson & Kristen Stewart’s Low-Key Concert Night

Before jetting off to Vancouver to begin filming Eclipse, Robert Pattinson and Kristen Stewart got some downtime together and enjoyed a concert Thursday night and then again, Friday night, in Hollywood.

Robert Pattinson & Kristen Stewart

The Twilight stars snuck into Bobby Long’s concert at Hotel Cafe about three songs into his set with Pattinson’s close pal Marcus Foster (who wrote a song on the Twilight soundtrack) on Thursday. The group watched the performance from a curtained off area on the stage where there was sound equipment and a few bar stools.

“Robert was super low-key when he walked in,” an onlooker tells revealed, adding Stewart, 19, and Pattinson, 23, went unnoticed by fans the entire night. After Long, a friend of Pattinson’s, finished his set, the group quickly exited the venue and jumped into a waiting cab.

The two headed out for a second night in a row Friday, this time catching Foster’s show at Hotel Cafe.

“Kristen and Rob, just the two of them, came in and walked towards the curtained-off area on stage where they watched Marcus,” says a source. “They seemd to go unnoticed.”

Stewart and Pattinson later showed up together with a group of pals at the Chateau Marmont, and hung out well into the night.

While the two have remained tight-lipped on their relationship, the actors have spent time together off set – and are more than costars, according to a source.

“Word on the set of Twilight is that [Michael] Angarano, [Kristen’s boyfriend], and she are completely broken up,” a source said. “While people don’t want to talk about it, everyone is pretty convinced that Pattinson and Stewart are hooking up.”