Kate Walsh — best known for her role as Dr. Addison Forbes Montgomery on the ABC medical dramas Grey’s Anatomy and Private Practice — is helping Cadillac unveil its new 2010 CTS Sport Wagon in an elegant ad that premiered on Tuesday.

As we’re sure many of you already know, General Motors — the American institution responsible for Cadillac, Chevy, and your Grandma’s old Buick — filed for Chapter 11 bankruptcy protection earlier this week. Needless to say, GM can use all the help it can get at this point.

So what say you? Does Kate nail this Caddy ad?