Ariana Grande
Ariana Grande and Nathan Sykes dated for four months in 2013 YouTube

It has been more than two years since their split but former couple Ariana Grande and Nathan Sykes have somewhat reunited. The Wanted singer has enlisted his ex-girlfriend's vocals for the remix of his latest single Over And Over Again, marking the second time they have shared the microphone.

Fans suspected the collaboration after the musicians began dropping clues and lyrics via social media with the hashtag #OverAndOverAgain before the news was confirmed. Addressing the remix, Sykes said: "I can't wait for everyone to hear the new version of Over And Over Again. It's such a special song to me and I'm delighted that I'm able to share this with not only a friend of mine but also somebody who is incredibly talented."

Following a performance on The X Factor, the original version reached number eight in the UK charts and serves as the follow-up to Sykes's debut solo single, Kiss Me Quick. The former boy band singer is also expected to perform the single on The Late Late Show With James Corden on 2 February. The track will feature on Sykes's untitled debut solo album, which already boasts writing credits from the likes of Babyface, Diane Warren and Harmony Samuels.

Ariana Grande and Nathan Sykes
Ariana Grande and Nathan Sykes will release their new duet Over And Over Again on 15 January 2016 Global Entertainment

The British singer dated Grande, 22, and they became one of pop's hottest young couples when they started dating in 2013. However, their romance came to an end four months later, although they have clearly remained on friendly terms.

Opening up about their break-up in January 2014, Grande told US radio DJ Shell: "We broke up a little while ago, but he's a really good friend. He's so talented. I am so glad to have met him and have a friend like him in my life. He's an amazing person. It was very civil. It was mutual."

Sykes and Grande first collaborated while they dated in 2013 on the ballad Almost Is Never Enough, which featured on Grande's debut album, Yours Truly.

Problem singer Grande is currently putting the finishing touches to her third studio album, which was expected to be titled Moonlight. However, the singer has revealed she is considering a name-change. After removing the Moonlight name from her Twitter bio, the Bang Bang hitmaker told her followers: "I've been debating. it's between [Moonlight] and another.......... they're my 2 favorite titles and songs. it's v hard [sic]."

Moonlight, which will feature the lead single Focus, follows on from Yours Truly and her second album, My Everything, which arrived a year later in 2014. The Over And Over Again remix is set to premiere on 15 January.

Listen to Ariana Grande and Nathan Sykes' Over And Over Again: