Check out the image and video.
Sources dish to the website that the pair spent more than four hours at the bar and "were in good spirits". Onlookers also reported that the pair "cozied up to each other".
Another source told Britain's The Sun: "There definitely wasn't any tension between them - Kristen gave Rob a couple of long looks and, when he went over, closed her eyes and put her head on his chest.
"At one point she came outside for a cigarette without him, but she looked distracted. She seemed much more relaxed when they left in the early hours."
Britain's Daily Mail also published a snap of Stewart and Pattinson hanging out with a group of pals after dining at a Hollywood restaurant on Monday.
The snapped sighting follows an earlier report that the duo hooked up at Hollywood's Chateau Marmont on Saturday.
Us Weekly reports that the pair made an "extremely low-key appearance" at the hotspot to celebrate a mutual pal's birthday on Saturday night.
The website quotes a source as saying the pair were "whispering very close and intimately" during the evening.
Chimed another: "They're afraid of backlash, so they're keeping things on the down-low".
Stewart and Pattinson are scheduled to participate in joint appearances to promote The Twilight Saga: Breaking Dawn - Part 2 in the coming weeks.
They're also expected to rock the red carpet at the movie's Hollywood premiere on November 12, and attend European screenings in London, Madrid and Berlin from November 14 to 16.
Speculation has been rife over what the promotion of the movie will be like. But it won't be a trainwreck, according to Stewart.
The starlet, making her first post-cheating scandal public appearance at the Toronto International Film Festival in September, told the Associated Press that hitting the red carpet with Pattinson by her side won't be a problem for her.
"We're going to be fine," Stewart said. "We're totally fine."
Stewart suffered a widespread public backlash in July after she admitted cheating on Pattinson with Sanders.
"I'm deeply sorry for the hurt and embarrassment I've caused to those close to me and everyone this has affected," the actress said in a statement at the time.
"This momentary indiscretion has jeopardised the most important thing in my life, the person I love and respect the most, Rob," Stewart continued. "I love him, I love him, I'm so sorry."
Sanders, 41, is married to British Vogue model Liberty Ross, 33. They have two children together.
FAST GOSSIP
And finally...
* Rihanna calls Robert Pattinson romance "bulls**t".
* Matthew Fox: "I have never hit a woman before. Never have, never will".
* Hulk Hogan sues Bubba the Love Sponge and Heather Clem over sex tape release.
* Jennifer Aniston breaks silence on engagement in teary interview.
* Note to paparazzi: Kanye West, Kim Kardashian are not interested in your pesky Reggie Bush questions.
* Scarlett Johansson reportedly splits from boyfriend Nate Naylor.
* Tina Fey and Amy Poehler to host Golden Globe Awards.
* Sharon Osbourne thinks Justin Bieber's fame won't last, needs more hair.
* Watch: First trailer for Carrie remake debuts.
* Listen: Christina Aguilera duets with Tony Bennett.
* Jennifer Hudson says Mariah Carey and Nicki Minaj American Idol feud is fake.
* Beyonce reportedly set for Super Bowl halftime show.
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- Rumour Has It
