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Sorry Mahomies, Austin Mahone is officially off the market!

Fifth Harmony singer Camila Cabello, 17, has confirmed she is the girlfriend of the 18-year-old pop star. The news follows more than a year of dating rumors, which spurred the nickname "Ausmila" among supporters of such a union, and weeks after the girl group, which was formed on FOX's short-lived reality show The X Factor, performed a last gig on his solo tour as an opening act.

She was asked about the issue on Bravo's Watch What Happens Live on Monday, while standing beside her four fellow group members, Normani Hamilton, 18, Ally Brooke, 21, Lauren Jauregui, 18, and Dinah Jane Hansen, 17.

"Who's the Mahone girlfriend?" host Andy Cohen asked.

"That would be me," Camila replied, raising her right hand and speaking into a hand-held microphone held by Jauregui.

"Oh my God!" Cohen exclaimed. "So you are indeed a Mahone, of course."

"Uh, a Mahomie," she said. "Oh yeah, he's a really good guy."

"How long have you been together?" he asked.

"Um, um, I dunno, I mean, I think we've known each other for a really long time, we've known each other for like, a year and a half now, like since we were, like on X Factor was one of the first-"

"My God, that's forever!" Cohen said.

"That was my way of dodging the question," she joked.

Camila appeared to catch his attention in 2012, when Fifth Harmony competed on The X Factor's second season in 2012. The group placed third.

" Hey gorgeous! Good job tonight. I voted for you," Mahone tweeted on Dec. 20 of that year.

The two continued to flirt online throughout the next few months.

In October 2013, when asked about dating rumors, the singer told MTV News that he had met Camila once at the Arthur Ashe Kids Day event the previous August and that "she's a really, really cool girl, very nice, but we're not dating."

Two months later, Mahone met up with Fifth Harmony at the 2013 KIIS-FM Jingle Ball, where he and Camila were photographed hugging.

Austin Mahone, Camila Cabello

Rich Polk/Getty Images for Clear Channel

The online flirtation continued and the two were also photographed together several times.

In May, Mahone tweeted cryptically, "The best relationships start off as friendships."

This past July, Mahone began a world tour in July and Fifth Harmony was an opening act at concerts in the United States, Canada and Brazil until Oct. 3. He is still on tour.

In September, a fan asked the singer, "Who's the last person you texted?" and he named Camila.

Mahone has not responded directly to Camila's confirmation of their relationship but did tweet on Tuesday morning, "Like you guys didn't know already." Camila favorited his post.

(E! and Bravo are both part of the NBCUniversal family.)