The Venezuelan dancer has been brought in to replace Katya Virshilas, who was axed by the BBC last week.
RTE reports that the 30-year-old is looking forward to being a part of the series, quoting her as saying: "If I could dance how I feel about joining Strictly then you'd be able to see how excited I am!"
Hauer is a former World Mambo Champion and has previously worked alongside Jennifer Lopez.
Three years ago, she auditioned for US reality series So You Think You Can Dance?, but was eliminated after the first few weeks.
BBC controller of entertainment Katie Taylor said of Haeur: "We're thrilled to have such a fresh and talented professional join us, and I can't wait to see what she will bring to the ballroom this autumn."
Strictly Come Dancing will return to BBC One later this year with another new face on the judging panel, with ex-ballerina Darcey Bussell replacing Alesha Dixon.
Watch Karen Hauer perform on So You Think You Can Dance? below: