Prince Harry and Meghan Markle's secret date night

The Duke and Duchess of Sussex's visit to the theatre was only revealed on Sunday. Photo / Getty Images

Meghan Markle and Prince Harry managed to evade the spotlight as they headed out in one of London's busiest areas over the weekend for a date.

On Saturday, the Duke and Duchess of Sussex slipped in to London's West End to catch an evening showing of The Tina Turner Musical, based on the US singer's life.

Their visit was only confirmed on Sunday when the production shared a message on Instagram confirming Meghan and Harry had been in the audience the night before.

View this post on Instagram

We were thrilled and honoured to welcome The Duke and Duchess of Sussex to #TinaTheMusical on Saturday for a private visit.

A post shared by TINA The Musical London (@tinathemusical) on Mar 3, 2019 at 6:55am PST

The couple's visit to the theatre comes as Meghan was appointed as royal patron for The Natural Theatre in January.

Meghan has held a long-term interest in the area, studying theatre at university and starring on legal drama Suits for seven years before marrying Harry.

Since marrying into the royal family Meghan has appeared at multiple public engagements related to the arts.

Last August, Meghan and Harry attended a special performance of Hamilton held to benefit the Duke's charity, Sentebale.

It's been a busy few weeks for the royal couple, with a heavily pregnant Meghan flying to New York to attend her baby shower.

After that Meghan and Harry flew to Morocco for a series of public engagements as part of an official visit.

The Duchess of Sussex's busy schedule has reportedly left Queen Elizabeth pleased with her commitment to royal life.

In an interview with Vanity Fair, a palace aide revealed: "The Queen is amazed by the Duchess' energy and stamina given that she is heavily pregnant.

"For the Queen and her generation, you generally hid your bump and put your feet up in this stage of pregnancy, but Meghan hasn't stopped."

In recognition of her dedication, Meghan would receive a handwritten thank you note from the Queen, a rare gesture from the 92-year-old royal, the palace aide claimed.