"We affianced on a glacier in Whistler (Canada). We reached this beautiful place by helicopter one day before Christmas Eve. It was a unique experience," said a posting on Klum's Web site.
Klum, 31, and Seal, 41, started dating last year, shortly after her breakup with Formula One racing boss Flavio Briatore, who is the father of her daughter, Leni, born in May.
Klum, who is a Victoria's Secret model and has appeared in Sports Illustrated magazine's swimsuit issue, separated from her husband of five years, celebrity hairstylist Ric Pipino (search), in November 2002.
Seal's "Love Divine" has been recently nominated for a Grammy Award in the male pop vocal competition.
His "Kiss From a Rose" won for record and song of the year, and he also grabbed the award for best male pop vocal performance at the Grammy Awards in 1996.