Jesse James at Lawyer Happy Hour

5/14/2010 1:42 PM PDT

Jesse James at Lawyer Happy Hour

Jesse James made a quick trip to Austin, TX yesterday and one of his destinations -- a law office, but it wasn't for anything divorce-related -- it was for Happy Hour.

James stopped by the law firm of Schwake Zielinski, L.L.P. -- where they just happened to be smack in the middle of Thirsty Thursdays.

Attorney Brad Zielinski told TMZ he was shocked when Jesse arrived, and his only connection to the firm is that Jesse bought a truck from one of Brad's friends.

The subject matter -- trucks.  Jesse didn't drink, stayed a short time and left.

TMZ broke the story that Sandra Bullock filed divorce papers in Austin last month ... using initials instead of full names to keep the papers under the radar.