The workwear inspired little black dress showed off the former-actresses long legs.
The special West End gala show was held to raised funds for Harry’s HIV charity Sentabale.
Meghan Markle and Harry met with the cast and appeared to greatly enjoy the performance.
How much did Meghan Markle’s chic outfit for the event cost?
Meghan wore a dress from Canadian fashion brand Judith & Charles.
Meghan lived in Canada for a number of years while she filmed for her previous role in cable drama Suits.
The dress costs CAD 550 or £330, a fairly modest prince for a dress worn by a royal.
Meghan added a pair of earrings that the Duchess had worn before, to the Queen’s 92nd birthday concert.
The Shaun Leane Vermeil Talon Earrings currently cost £225.00 from Farfetch.com.
Another element of her outfit that Meghan recycled was the shoes, which she wore to arrive at Dublin airport last year.
The Paul Andrew Black ‘Pump-It-Up’ heels are not currently available online, however, the brand’s shoes cost up to £745 for leather boots and £645 for pumps.
Meghan’s bag has yet to be properly identified although it is thought to be the Becksondergaard box clutch in black glitter, priced at £49.13.
This whole outfit costs £1,249.13, although Meghan was worn most of the pieces before.
Meghan added black eye make-up and a shimmery highlighter.
The occasion marks Meghan’s West End debut as a member of the Royal Family, having once worked as an actress before becoming the Duchess of Sussex.
However, this is not Meghan’s first trip to see the musical.
According to reports Meghan already attended the show without Harry.
Meghan Markle and Camilla recently holidayed together in Scotland with their husbands.
Who is Meghan Markle? Quick profile
Meghan Markle was born Rachel Meghan Markle, on August 4, 1981 to parents Doria Ragland and father Thomas Markle.
Her father was previously married to Roslyn Loveless and Meghan has two elder half sibling – sister Samantha Markle and brother Thomas Markle Junior.
Meghan’s first television appearance in the USA was in an episode of the medical drama General Hospital in 2002.
She later moved on to roles in CSI, Without a Trace and Castle along with bit parts in Hollywood films including Get Him to the Greek, Remember Me and Horrible Bosses.
Meghan was also a “briefcase girl” on Deal or No Deal – but her most famous role was as Rachel Zane in legal drama Suits, which launched in 2011.
She was written out in the finale of the seventh series when her character got married, which aired in April 2018 – just before she got married herself.
Charity and humanitarian work
Meghan Markle’s career in television has gone hand-in-hand with her support for causes close to her heart.
She wrote about the stigma around menstrual health in an article for Time magazine and was a Global Ambassador for World Vision Canada – with whom she travelled to Rwanda for the charity’s Clean Water Campaign.
And her commitment to gender equality has seen her work with the United Nations – receiving a standing ovation in 2015 for her speech to mark International Women’s Day.
In September 2011, she wed film producer Trevor Engelson, who she began dating in 2004.
But the pair divorced two years later in August 2013, citing irreconcilable difference.
She was in a relationship with celebrity chef Cory Vitiello for almost two years, before they broke it off in 2016 but the two remain good friends.
And in June 2016, she met Prince Harry on a blind date set up by a mutual friend.
Their relationship began in October that year and just over one year later, on November 27, 2017, the pair announced their engagement.
They married on May 19, 2018 at St George’s Chapel in Windsor Castle.
Some have claimed Meghan Markle is the first mixed-race member of the Royal Family.
Historians are still arguing about Queen Charlotte, the wife of King George III.
But Meghan will be the first royal to openly embrace a mixed-race heritage.
She has written about the difficulties of being a biracial actress in Hollywood as she claims she is not black enough for some roles and not white enough for others.