All eyes will be on 36-year-old Meghan Markle tomorrow as she swaps the world of showbusiness for Sandringham for the first of many Royal Family ­Christmases. 

Prince Harry’s fiancee is expected to accompany the Queen and her future in-laws to church on the royal estate in Norfolk before sitting down to a traditional lunch of turkey and all the trimmings, including Brussels sprouts served on silver salvers. 

But the LA-born actress will face her first real test as a future royal bride tonight when the Windsors gather for their annual ­Christmas Eve festivities, which follow the German tradition of opening their presents then.

The royals usually exchange jokey gifts worth as little as a few pounds.  

One Christmas Harry, 33, presented the Queen with a shower cap emblazoned with the words Ain’t Life A Bitch, while Prince Charles was so delighted with a white leather toilet seat from Princess Anne that he now takes it on overseas tours. 

With Prince Philip running the show, the gifts have to be laid out on a red trestle table in the drawing room, before everyone opens their gifts in front of each other at about teatime. 

Hopefully someone will have told Meghan not to splash out. 

Princess Diana was embarrassed at her first Royal Family Christmas after buying everyone expensive cashmere jumpers and mohair scarves. 

Royals arrive at Sandringham in order of seniority, with Prince Charles and the Duchess of Cornwall turning up last, shortly behind the Duke and ­Duchess of Cambridge. 

It is thought Harry and Meghan are staying with the Cambridges at their country bolthole Anmer Hall, which is just a few miles from the “big house” on the 20,000-acre royal estate. 

After dressing in their finery for a sit-down banquet with men in black tie and the ladies in long evening gowns and tiaras, they dine on Norfolk shrimps, lamb or game shot on the estate and a pudding of souffle or tarte tartin. 

White wine is served with the starter, claret with the main course, and champagne with the pudding. 

The royals play Charades until midnight.   

Nobody is permitted to go to bed until the Queen calls it a night. 

Christmas morning starts with a full English breakfast before the royals walk to the church for a service at 11am. 

For the collection, the Queen, Philip and Charles each give a £10 note that has been ironed and folded by a valet so that the monarch’s head faces outwards. 

Lunch is finished in time so that all can watch her Christmas message to the nation on TV at 3pm.