Which 5SOS boys are in relationships? Michael Clifford's romance with Crystal Leigh is heating up. So are any of the Five Seconds Of Summer members still single?

Clifford posted a cute picture with Leigh and some other pals on Monday. They were on a gondola at the Ungasan Clifftop Resort in Bali. Leigh also posted some pics of the vacation, where they were joined by Sahara Ray and Ashton Irwin's ex Bryana Holly, among others.

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Michael Clifford and Crystal Leigh's tropical vacation came shortly after he confirmed their romance on Instagram. Last week, he posted a cute video of the couple kissing during a New Year's celebration.

Michael Crystal Twitter Michael Clifford has been spending a lot of time with Crystal Leigh.

"I know I'm late, but happy new year everyone. especially to my love @crystalleigh for making 2016 infinitely better than I thought it would be," he captioned the video. "here's to much greener pastures in 2017, and much less awkward hand motions. (you know I'm bad at this)."

But Clifford isn't the only 5SOS member in a relationship. Luke Hemmings and Arzaylea are still going strong after about a year of dating. Their romance survived numerous controversies, from allegations that Arzaylea leaked photos of Hemmings to reports that she cheated on him. And last week, the couple spent time in Sydney together.

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Calum Hood, meanwhile, is being linked to Nia Lovelis. They previously attended Lollapalooza together and were spotted on a possible date in New York City. And they were apparently photographed kissing back in November. But they still have not gone public with their rumored relationship.

So Ashton Irwin may be the one 5SOS boy who is still single. There were rumors that he was dating Hailey Baldwin, but he quickly shut those down. Lately, he has been spending a lot of time with YouTuber Alexa Losey. She even posted a photo of the duo with the caption, "Thankful to have a friend like you in my life, king of the cowboys." They also wrote some cute messages to each other on Instagram.

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Alexa And Ashton Some fans are hoping that Ashton Irwin and Alexa Losey will get together.

For now it appears that Irwin and Losey are just friends. But some are already starting to ship the two stars.

Who is your favorite 5SOS couple? Let us know your take in the comments section below!