Both wore outfits we've seen previously, with Prince William choosing a classic black and white suit and Kate choosing a long-sleeved lilac dress by designer Emilia Wickstead, which she wore during her royal tour of Germany in 2017.
Wednesday's outing was the Duchess' first at the V&A since being made the museum's patron in March, so it was no doubt a poignant event for her.
Meanwhile, Meghan has also opted for the Prince of Wales check before, wearing an off-shoulder top by NY brand Theory during her visit to Cardiff in January.
William and Kate have always been involved in mental health initiatives through their Heads Together campaign.
Eagle-eyed fans of Kate's style will recognise the frock from her and Prince William's royal tour of Germany and Poland a year ago.
Kate returned to royal duty last week after being on maternity leave since the birth of Prince Louis in April.
It's been said before that the mum of three has a keen interest in photography and has taken some of the official royal portraits of her children herself.
The Duke and Duchess viewed the work of contemporary fine artist Dario Vargas, who had painted an original piece for the event.
Erdem has become somewhat of a go-to designer for members of the royal family, with the label being the favourite to design Princess Eugenie's wedding dress. Prince George and Princess Charlotte have starring roles as pageboy and bridesmaid at the ceremony at St George's Chapel in Windsor.