The pair were casual and relaxed for their low-key date. Harry, still sporting the beard he grew during his Antarctica trek to the South Pole with the Walking with the Wounded charity, wore a grey baseball cap and matching shirt with a pair of jeans and casual shoes.
Former dance student Cressida was equally as casual in a black jacket, skinny black jeans and Nike Air Max trainers. A cute orange beanie hat completed the trendy look. She appears to have been meeting the Prince after a day out, as she also carried a black rucksack.
Harry and Cressida's relaxed mid-January date took place close to to his bachelor pad at Kensington Palace. It comes after the pair reportedly did not spend Christmas together.
It is understood that the 24-year-old enjoyed the festivities with her family.
A burger on the menu at Byron from 7 January to 24 February
While Cressida has been to Sandringham on two different occasions, neither the Queen or Prince Philip were in residence at the time.
According to a courtier: "His Royal Highness knows that it would not be appropriate for Miss Bonas to join the Royal family for Christmas until they are a married couple."
The couple have recently been the subject of wedding rumours, which Cressida's half-brother has denied.
Jacobi Anstruther-Gough-Calthorpe said the buzz surrounding an impending wedding was "ludicrous".