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Mark Gray and Dahvi Shira
August 18, 2011 06:50 PM

Sandra Bullock and Ryan Reynolds‘s visit to Wyoming last weekend also included a low-key dinner with friends.

The Proposal costars – who a source has told PEOPLE are “like brother and sister” – made their way to Rendezvous Bistro in Jackson Hole on Sunday.

Sans Bullock’s baby son Louis, who accompanied the actress, 47, and Reynolds, 34, on the trip, the duo joined two other guests for what a source says appeared to be a “really informal” meal.

RELATED: Inside Sandra Bullock’s New Life

“They didn’t seem like they were a couple,” the source says. “It was very relaxed, totally friendly. She wasn’t romantic with anyone at the table.”

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