Jake, 18, and Cara, 20, made their first public appearance together last week at a Burberry event in London - and they went on to attend Harry's birthday bash.
A source told The Sun: "Cara and Jake are an item. They first met a couple of months ago at a party she was at with her best pal Rita Ora. They hit it off straight away."
Nottingham lad Jake's debut LP is currently riding high in the charts and his single Lightning Bolt was played before the men's 100m final at London 2012 - which was of course won by a certain Mr Bolt.