Halep became the first Romanian to win Wimbledon when she beat Serena Williams 6-2 6-2 in what has been described as one of the finest performances in a final in the tournament's recent history.
The Duchess of Cambridge, who is the patron of the All England Lawn Tennis and Croquet Club, showed her inner grace when she warmly greeted a flustered Simona in a function after her win.
Halep was understandably overcome as she met the royal, attempting awkwardly to curtsey, only to be waved away by a smiling Kate.
The mother-of-three joined sister-in-law Meghan Markle and sister Pippa in the Royal box at the prestigious sporting event.
Kate stunned in a green Dolce and Gabanna dress with gold buttons, while the Duchess of Sussex wore a Hugo Boss skirt and Givenchy shirt.
The duo's day out comes just days after Meghan was slammed by royal fans after she instructed her royal security personnel to inform spectators at Wimbledon not to take photos of her.
Despite being a public figure, Meghan insisted that she was at the Grand Slam in a 'personal capacity' so to watch her friend Serena William play, and therefore off duty.
Having been previously dubbed 'Duchess Difficult' after rumours of her diva demands made their way from the palace and into the public, the new mum is now being mocked for her 'no photos' request, earning the nickname 'Princess Privacy'.
Earlier this week, Kate and Meghan were also seen spending time together at the Polo where they watched their husbands Prince William and Prince Harry take part in a charity match.
The pair were all smiles as they cheered and chatted from the sidelines with their adorable children, Master Archie Harrison, Prince George, Princess Charlotte and Prince Louis.
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