Sandra Bullock celebrated her 50th birthday far away from the glitz and glamour of Hollywood last week.

The A-list actress turned the big 5-0 on Saturday, but Thursday evening she was in Jackson Hole, WY with a handful of friends and her younger sister Gesine.

Comedian and talk show host Chelsea Handler posted a photo of Bullock and Gesine on Instagram, captioning it simply “Happiest birthday.”

The group celebrated at the Million Dollar Cowboy Bar, where the Southern Soul Allstars were performing.

“They said they kept it [quiet] because she sometimes likes to just act like a normal person,” said Dianne McManus, who performs vocals, piano, and keyboard for the group. “They came out and danced and took a bunch of pictures.”

A source told E! News that the group of friends entered the bar between 9:00 pm and 10:00 pm Thursday night: “There were probably six to ten women in the group. It appeared to be a ladies night … They just came in to listen to the band.”

Comedian Whitney Cummings posted a photo of the bar’s neon sign on Instagram Friday. The caption read “Now I know where all the cowboys have gone. Let’s go make some bad choices!”

Word must have spread quickly about the party because, according to the Southern Soul Allstars’ Facebook feed, the bar was packed the following night with people hoping Bullock and her friends would show up again.

McManus had just watched Gravity on Wednesday and, unaware that Bullock was present Thursday night, she gave the movie a “pretty bad review [on stage], saying why would you do a movie where George Clooney died in the first 30 minutes and she didn’t even kiss him?”

McManus said she’s a huge fan of Bullock and wouldn’t have made the comments if she’d known the star was in the audience.

Image via Instagram, Chelsea Handler