The stars will embark on the 2012 tour, commencing on January 20, with Kate Thornton returning as host.
Len Goodman, Bruno Tonioli and Craig Revel Horwood will return as the judging panel, with Horwood directing the arena tour for a second year in a row.
Dell'Olio said: "I am really excited to be part of the tour. I enjoyed every moment of my time on the show and it is great I now get to continue with my new found passion."
Donovan added: "I have been overwhelmed with the support I have had so far on the show and I have really enjoyed dancing every week. Learning so many different dances has been an amazing experience and I can't wait to see the new routines we'll be performing on the tour."
Healey also spoke of her excitement, saying: "I am so thrilled to be part of the Strictly tour, the TV show has been more fun than I ever could have imagined and I can't wait to carry on dancing every week."
The tour will begin at the Birmingham NIA, and will travel to Nottingham, London, Manchester, Sheffield, Liverpool, Newcastle, Glasgow and Dublin before concluding at the Belfast Odyssey on February 26. Tickets have been on sale since September.
Brendan Cole is set to step in for Artem Chigvintsev on Saturday's live show, after the Russian pro suffered a back injury earlier this week.
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