Crown Prince Haakon's marriage to Mette-Marit caused headlines for various reasons. What was one of them?

Explanation

Mette-Marit, Crown Princess of Norway, met Crown Prince Haakon at a rock festival in Kristiansand. When the engagement was announced, many Norwegians felt that the Crown Prince’s choice of partner was inappropriate, not least because she was a single mother. Nevertheless, she has since taken the country by storm.