The redhead is back! ABC has confirmed that Kate Walsh, whose spin-off Private Practice is on hiatus until fall, will return to Grey's Anatomy as Dr. Addison Montgomery for one episode this spring, Entertainment Weekly reports.

Executive Producer Shonda Rhimes is still fleshing out the script, so no word yet on when Kate Walsh's episode will air or what the premise will be.

ABC will air five original episodes of Grey's Anatomy beginning April 24.

The last time Kate Walsh (as Dr. Addison Montgomery-Shepherd) was seen walking the hallways of Seattle Grace was in the series premiere of Private Practice, which is the 2007-08 season's second most-watched new drama.

In the Private Practice pilot, Addison said a tearful goodbye to Seattle Grace to start a new life at Oceanside Wellness Center in Southern California.

What do you think about Addison's return? We'd love to hear your thoughts - as well as your best guesses for what the plot line will entail ...

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