The Grey's Anatomy and Private Practice star and her fiance at the premiere of Katherine Heigl's new movie, Knocked Up.

The newly-engaged Grey's Anatomy and Private Practice star out in public with the real-life McDreamy in her life. Producer Alex Young and Walsh got engaged last month.

Justin Chambers and his wife, Keisha, along with Kate Walsh and her fiance, Alex Young, at the Chrysalis Butterfly Ball, an event hosted by Grey's Anatomy co-star Eric Dane and his actress wife, the beautiful Rebecca Gayheart.

These two are getting married. Congratulations! In this photo, they're hanging out at the Chrysalis Butterfly Ball, run by Eric Dane - her Grey's Anatomy co-star - and Rebecca Gayheart, Dane's wife of two years-plus.

The cast of the ABC hit series Grey's Anatomy, Season 3 style. They won many awards and earned a lot of money.

Grey's Anatomy and Private Practice star Kate Walsh looks beautiful in this color. She'll be a wedding natural.

And outta sight, if you ask us. Kate Walsh has left Seattle Grace for her very own Private Practice, and we wish her nothing but the best!

Kate Walsh and her friends party at Tao in Las Vegas. Kate, who is engaged to Alex Young, celebrated her bachelorette party in early August, 2007!

Kate Walsh and Justin Chambers' wife, Keisha Chambers, party in Las Vegas. The event? Kate's bachelorette party! Awesome.

Kate Walsh, late of Grey's Anatomy, and Tim Daly lead the cast of Private Practice, one of ABC's most anticipated fall shows. How will the Grey's Anatomy spin-off fare?

Kate Walsh, the former star of Grey's Anatomy, prepares to wed fiance Alex Young this weekend. Congratulations to the happy couple!

Kate Walsh and Alex Young tied the knot Labor Day weekend in Ojai, Calif. The Private Practice and Grey's Anatomy star met her movie exec fiance earlier this year. Congrats!