After Thursday's "Desire," we all saw the previews for next week. It looks like quite the two-part episode brewing. Along similar lines, we happened across this ad in TV Guide for the two-hour Grey's Anatomy special - "The Other Side of This Life (Parts I & II)" an episode that as the pilot for the long-awaited Kate Walsh-led spin-off, Private Practice...

It's a cool ad, and appropriate that it features the cast of Grey's Anatomy along side the new stars of Private Practice (including Taye Diggs and Tim Daly), with Addison Montgomery on the verge of a major life change.

Click here for some Private Practice promotional pictures. We're eagerly looking forward to the pilot and to both parts of next week's Grey's Anatomy event. We'll post some longer previews (as well as potential spoilers) as the big day draws nearer.

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.