AceShowbiz - Niall Horan is rumored to be back on the market after calling it quits with his girlfriend Hailee Steinfeld. The lovebirds are said to be ending their relationship after a report suggests that he has been spotted on celebrity dating app Raya, which has been described as "Tinder for famous people."

"Niall has been acting single over in London lately, so people were getting suspicious that he's back on the market," an insider tells Goss.ie. "Then when his profile started popping up on Raya, it became clear that he's single and back on the dating scene."

Adding fuel to the rumors, Niall didn't give Hailee a birthday shoutout when she turned 22 on Tuesday, December 11 even though he did so last year. It also appears that the "Pitch Perfect 3" actress has unfollowed the One Direction member on Instagram. Making things worse, a video has recently surfaced showing her enjoying a night out with his ex-boyfriend Cameron Smoller.

So Hailee was with Cameron 🤔
Anyway it's none of my business so thank u , next 🖤

pic.twitter.com/CRwCzJQ9bA

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— rina (@homewithnarry) 11 November 2018

Reps for Niall and Hailee didn't immediately respond to request for comment.

The breakup rumor sure came as a surprise for fans, as Hailee gushed about how happy she was with Niall in the December issue of Cosmopolitan. "When you fall in love, you pick up on the tiniest things about yourself. I am one to spread [out] on the mattress and take up every inch of space," she said. "Now I don't want to do that anymore. I want to make as much as room for you possible."

"You start doing things for this person and going out of your way to make them happy," she added. "And when you see them happy, it makes you happier. When you love who you are with that person... there's nothing that compares."

Niall and Hailee confirmed their long-running dating rumors in August of this year, when they were spotted kissing in Los Angeles.