Meghan Markle's latest outfit shows that she may already be getting advice from Kate

Kate Middleton is a seasoned pro at handling the hectic festive season with the royal family, having been married to Prince William for six years now, and now it seems that the Duchess may have been passing on some of her wisdom to Meghan Markle.

Meghan Markle and Prince Harry announced their engagement last month, and with the date for their impending nuptials set, former American actress Meghan is getting well and truly stuck in to royal family life. Following the announcement from Kensington Palace that Meghan Markle would be joining the royal family for Christmas this year at Sandringham, the bride-to-be attended another firm royal family fixture for the festive season this week – the Queen's annual Christmas lunch.

The special occasion, which is meant to be informal and festive, would still have been a huge deal for newcomer Meghan as the gathering of the Queen's extended family would have been the star's first time meeting many of Prince Harry's relatives.

Choosing an outfit for such an important occasion may have been problematic, but it seems that Kate was on hand, as she has been since Meghan moved to London, to provide guidance and tips for her future sister-in-law.

Despite the fact that there are no photos from inside the private event held at Buckingham Palace, eagle-eyed fashion fans spotted in the photos of the couple in their car that Meghan Markle opted for a dress by Self-Portrait for the royal family festive feast yesterday.

From photos of Meghan being driven to and from the event yesterday, you can just about see the high-necked gown with monochrome lace detail.

Self-Portrait is a label that the Duchess of Cambridge has worn in the past, so Kate knows that it's sure to be a hit with royal fashion fans, as well an acceptable label to wear for an event connected to the monarchy.

Kate last wore a Self-Portrait dress dress when she attended the premiere for A Street Cat Named Bob in London's Leicester Square.

Could the Duchess have passed on this top tip to Meghan? We'll never know for sure, but we do know that Kate has been a strong support for Meghan since the bride-to-be moved to London. Meghan described Kate's help and support as 'wonderful', with Harry adding 'Catherine has been absolutely amazing' in the couple's televised interview after announcing their engagement.