But there's reportedly one royal who might not be so keen on the matrimonial union - the Duchess of Cambridge.
Friends of Cressida told the Daily Telegraph: "Cressida has said Kate is not keen on her relationship with Harry. Cressie and Isabella could not be closer. Where she goes, Bella goes.
"Kate does not like Isabella because William loved her, and that caused their break-up. Bella's treatment at the royal wedding won't be forgotten."
And what "treatment" was that, we hear you cry. Well, Isabella, who married Sir Richard Branson's son, Sam Branson, this year, was invited to the Royal Wedding ceremony, but was reportedly not invited to the two receptions that followed.
She was given a lift home after the ceremony by film director, Guy Ritchie, reports the Daily Telegraph.
She recently described giving birth as "perfect, natural" in an interview with Vanity Fair. A source told the magazine: "She said it was straightforward and there were no complications. She wanted a natural birth and she was so happy she was able to have one."
And how did she manage to look so groomed just after giving birth? She had her hairdresser, Amanda Cook Turner, on-hand throughout the month of July, ready and waiting to style those signature brunette waves.
See? We've forgotten about "Bella" already...
More Duchess Kate style moments: