TV
Phillips, 66, will team up with regular hosts Adrian Chiles and Christine Bleakley as the show's Strictly Come Dancing expert. Strictly will run for 14 weeks during the autumn.
Earlier today, it was confirmed that Phillips is leaving the reality series. Alesha Dixon and Darcey Bussell have replaced her on the panel.
"Arlene played a vital role in making Strictly a hit and I would like to thank her for all her work on the show," said BBC One controller Jay Hunt.
"I am delighted she is now forging a new relationship with BBC One by joining the highly-successful One Show team."
Speaking about her move, Phillips said: "I am delighted to be part of The One Show. I will miss Strictly. It has been a big part of my life for six years."
One Show presenters Bleakley and Dom Littlewood have appeared as contestants on Strictly in previous years.
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