Meghan Markle and Prince Harry weren't among the friends who gathered to celebrate Kate Middleton's 37th birthday last weekend.

Every year in January, Kate and Prince William celebrate her birthday with a gathering at their Norfolk home. A group of friends stay at Anmer Hall, take part in a shoot and also attend church on Sunday with the Queen.

However, it's not unusual for Prince Harry and Meghan to miss the small affair out.

Claims have swirled about tension between brothers William and Harry and their wives, Kate and Meghan. But a source said that the couples enjoyed a memorable first Christmas together in 2017.

“They really loved Christmas and all had a wonderful time,” a source said. “I think they are definitely not best friends, but it was a really special time for them all to spend together.”

Since Meghan officially joined the royal family in May, there has been a shake up in its synergy – one that many believe was inevitable.

“Wives do change the dynamic, and they both have very strong wives,” an insider said. “If you bring two independent-minded women from the real world into the royal world, they are going to want to have an impact.”