There's an article here from BB about how Frederik, CP Victoria and CP Haakon have a fantastic relationship (from Victoria in an interview) and that they often dicuss their fate as future Heads of State together, either at official occasions or through texts and emails.
Billed-Bladet - Victoria sms with Frederik
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"Not everyone who chased the zebra caught it, but he who caught it, chased it" - South African proverb