The hotel heiress was first pictured kissing the multi-millionaire entrepreneur onboard a yacht off the coast of Spain at the start of June (15) and reports suggested they had been inseparable since meeting in Cannes, France weeks earlier.

Hilton appeared to confirm the romance on Wednesday night (08Jul15) by sharing a picture of her gazing into Gross' eyes on, alongside the caption: "Soulmates".

The couple was in London on Wednesday evening for drinks with Hilton's mother Kathy and sister Nicky ahead of Nicky's wedding to British banking heir James Rothschild at Kensington Palace on Friday (10Jul15).