The Sunday Express reported that the couple, who have been dating since 2010, were planning to become officially engaged before the end of the year and were set to live together in Kensington Palace, which also serves as the official residence for The Duke and Duchess of Cambridge and Prince Harry.
"The story is not true", the spokesman told HELLO!
Princess Eugenie and Jack Brooksbank have been dating for six years
Eugenie and Jack, who is the manager of celebrity hotspot club Mahiki in Mayfair, have been together for six years after being introduced by friends during a break in Switzerland.
Jack is very close to Princess Eugenie's parents and is often pictured in their company. Last year, they attended the Ascot races together.
Princess Eugenie and Jack at Ascot with her parents
The son of an accountant, 29-year-old Jack was educated at £10,000-a-term Stowe school in Buckinghamshire and with the support of his parents chose to work in hospitality.
After spending several years working at Chelsea's Admiral Codrington, a pub and private dining room, and at The Markham Inn, he finally went on to become the manager of Mahiki, one of London's most prestigious nightclubs.