Indeed, as Bullock and Reynolds, 34, grow closer in the wake of their shocking marital splits -- she was "glowing" during a flirty New Year's Eve weekend with him in Austin, Tex. -- it's a culmination of a long, close friendship.
How did Sandy meet Ryan, anyway? Way back in 2000, when Reynolds, then a star of ABC sitcom Two Guys, a Girl and a Pizza Place, was introduced to Bullock through a producing partner. The low-key, funny duo struck up a platonic friendship.
The bond endured even as Bullock dated Ryan Gosling and he romanced fiancee Alanis Morissette; after Bullock wed Jesse James and Reynolds tied the knot with Scarlett Johansson, the foursome even went on vacations together.