Rory McIlroy and Caroline Wozniacki

Rory McIlroy has taken to social media to confirm his love affair with tennis ace Caroline Wozniacki is back on track.

The former world number one golfer tweeted his congratulations after Wozniacki won the Luxembourg Open on Sunday.

Media observers say the public declaration of ‘love’ in the tweet is the surest sign yet that sport’s hottest couple are back together.

The tweet comes after weeks of speculation that McIlroy had split with the Danish star amid rumors he was texting Irish model Nadia Forde.

But McIlroy, second at the Korean Open on Sunday, called Wozniacki ‘my girl’ in the tweet after the 21st win of her career.

He wrote: “#21 #luxembourg #mygirl @CaroWozniacki.”

Various Irish papers report that it is the first confirmation that the pair are still an item after weeks of media speculation on their future.

Wozniacki also denied the stories last week when she said: “I’m so tired of the rumors.

“They occur every time Rory and I are apart a few days or do not write on Twitter.

“There is nothing in it, and from now on I just think that I will keep my private life private.

“All is well and then there’s not much more to say about it the relationship.

“I just want to be allowed to live my life off the court without all the speculation.”

The Danish star also told her Twitter followers that she believes McIlroy is a dead ringer for One Direction singer Harry Styles.

She wrote: “Went to see the One Direction movie with Rory McIlroy!

“They have won me over! Harry Styles and Rory should swap jobs sometimes! lookalike.”