It's a phrase made famous by the Marilyn Monroe movie classic The Seven Year Itch.
After seven years together, the honeymoon is reckoned to be well and truly over for many marriages – as Seal and Heidi Klum’s recent split has shown.
Like Marilyn’s iconic white dress, these 10 celebrity couples have all seen their relationships blown away seven years down the line...
Until news of their split last week, it was seen as one of strongest marriages in showbiz. But Brit singer Seal, 48, and German model Heidi, 38, who married in 2005, realised they were never going to survive the seven-year curse.