Tennis player Caroline Wozniacki of Denmark (L) works as the caddie for her ex, Northern Ireland's Rory McIlroy, during last year's Masters
Golfer Rory McIIroy and tennis player Caroline Wozniacki
Caroline Wozniacki of Denmark is seen wearing her engagement ring from Rory McIlroy
Rory McIlroy and Caroline Wozniacki
Rory McIlroy of Northern Ireland talks to his fiance Caroline Wozniacki of Denmark, after coming joint second after the final round of the Abu Dhabi HSBC Golf Championship at Abu Dhabi Golf Club on January 19, 2014 in Abu Dhabi, United Arab Emirates. (Photo by Matthew Lewis/Getty Images)
NEWBURY, UNITED KINGDOM - APRIL 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Rory McIlroy and Caroline Wozniacki attend the Dubai Duty Free Race Day at Newbury Racecourse on April 20, 2012 in Newbury, England. (Photo by Indigo/Getty Images)
Rory McIlroy and Caroline Wozniacki at a friend’s wedding
Rory McIlroy and Caroline Wozniacki are sighted at the Sony Tennis Open 2013 at Crandon Park Tennis Center on March 19, 2013 in Key Biscayne, Florida. (Photo by Uri Schanker/FilmMagic)
Rory McIlroy and Caroline Wozniacki arrives at Sony Open Player Party 2013 at JW Marriott Marquis on March 19, 2013 in Miami, Florida. (Photo by Gustavo Caballero/Getty Images)
Caroline Wozniacki and Rory McIlroy attend the 2012 US Open party hosted by Poland's Consul General at Beaux Arts De Lamar Mansion on August 25, 2012 in New York City. (Photo by Charles Norfleet/Getty Images)
Despite their high-profile relationship Caroline Wozniacki has had a hugely positive effect on Rory McIlroy's career
Rory McIlroy with his girlfriend Caroline Wozniacki during day one of the Turkish Airlines World Golf Final.
Rory McIlroywith his girlfriend Caroline Wozniacki at an Ulster rugby match at Ravenhill.
Rory McIlroy with girlfriend Caroline Wozniacki. Photo: Getty Images
Golfer Rory McIlroy with girlfriend and world number one tennis player Caroline
Wozniacki of Denmark.
Rory and Caroline visit Sydney together. (Twitter: Caroline Wozniacki)
The couple enjoying heights in Australia. (Twitter: Caroline Wozniacki)
Caroline does her best 'Rory' impression. (Twitter: Caroline Wozniacki)
Eating breakfast in New York, the Twitter photo that confirmed their relationship was still on during the summer. (Twitter: Caroline Wozniacki)
Caroline Wozniacki Party - Copenhagen...Rory McIlroy in Denmark to support Caroline Wozniacki at her home tournament this week, the e-Boks Open. Caroline Wozniacki and her family hosted a party at Zen nightclub in Copenhagen, Monday April 9th, 2012. Rory and Caroline arrive at Zen. PHOTOGRAPHER ANTHON UNGER / POLFOTO...E
Last week when questions about marriage plans Caroline said: 'I think that question will be for him to answer.'
Rory McIlroy stands with his caddie, and girlfriend, Caroline Wozniacki. Photo: Getty Images