Harry's ex posts cryptic message: 'How you treat people ultimately tells it all'

Cressida Bonas split from Harry in 2014. Photo / Getty Images

As news of her royal ex's engagement makes headlines around the world, Cressida Bonas has found herself under a brighter spotlight than usual this week.

But the 28-year-old actress appears to be taking the attention in her stride and is using it as a chance to share uplifting messages with her supporters, the Daily Mail reported.

Taking to Instagram, Bonas, who split from Prince Harry in 2014, posted an inspirational quote to her followers about the importance of treating people with respect, adding the caption, "truth".

It reads: "No matter how educated, talented, rich or cool you believe you are, how you treat people ultimately tells it all."

Bonas accompanied the quote with the caption: "Truth #quotestoliveby".

View this post on Instagram

Truth 🙌🏼 #quotestoliveby 🦋👊🏻

A post shared by Cressida Bonas (@cressida_bonas_) on Nov 28, 2017 at 7:44am PST

The image was shared on Tuesday afternoon (UK time) as details of Prince Harry and Meghan Markle's plans for their spring nuptials continued to emerge.

It was revealed that Markle, 36, will become a British citizen ahead of the ceremony and that the couple will tie the knot in Windsor.

It was also announced that her first royal engagement will be on Friday, when she will join her fiance, 33, in an appearance in Nottingham.

Bonas was once the woman many presumed would one day be planning a wedding with Harry.

Bonas and Prince Harry attend We Day UK, a charity event to bring young people together at Wembley Arena in 2014. Photo / Getty Images

She certainly had all the makings of a princess: she is friends with Princesses Beatrice and Eugenie, joining the former in the world record attempt to complete the London Marathon in a human caterpillar in 2010, the latter is said to have introduced her to Harry.

She is the daughter of renowned 60s It girl Lady Mary Gaye Curzon (whose father was the 6th Earl Howe) and Old Harrovian Jeffrey Bonas (her mother's third husband), who owns a fabric company called MacCulloch & Wallis.

Her parents have racked up six marriages between them so Bonas has a number of half brothers and sisters including soon-to-be a Branson, Isabella, who was once admired by Prince William, and Gabriella Wilde, a model for Burberry.