'Grey's Anatomy' Actress Kate Walsh Engaged

Kate Walsh has plenty of reasons to celebrate this week.

ABC announced that she'll star in a "Grey's Anatomy" spinoff in the fall, and the 39-year-old actress told Us Weekly magazine Tuesday that she's engaged.

"It happened a few days ago," Walsh said of her engagement to Alex Young, a studio executive. "I'm on cloud nine."

"Private Practice" takes her "Grey's Anatomy" character, Dr. Addison Shepherd, from Seattle and moves her to Los Angeles. There she reconnects with a friend whose medical practice needs an obstetrician -- and with the friend's former husband and business partner.