Sandra Bullock and Ryan Reynolds hooked up ... for a friendly hike in the Wyoming wilderness -- along with Sandy's adorable son Louis Bardo.
Ryan carried Louis in a backpack during the nature walk through Grand Teton National Park last weekend.
The trio is vacationing in Jackson Hole with a few other friends, but we gotta ask ...
Ryan Reynolds & Sandra Bullock
Vacationing Together ...
8/17/2011 9:45 AM PDT BY TMZ STAFF
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