They're official!

Fifth Harmony's Camila Cabello confirmed that she is dating fellow pop star Austin Mahone while appearing on Bravo's "Watch What Happens Live" on Monday night. However, the singer was not about to give host Andy Cohen too many details.

"Who's the Mahone girlfriend?" asked Cohen, when chatting with the ladies of Fifth Harmony about celebrity boyfriends.

"That would be me," replied Cabello, surrounded by bandmates Normani Hamilton, 18, Ally Brooke, 21, Lauren Jauregui, 18, and Dinah Jane Hansen, 17.

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

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

"How long have you been together?" asked Cohen, pressing for more information on the young relationship.

"Um, um, I dunno, I mean, I think we've known each other for a really long time," answered Cabello. "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!" said Cohen.

"That was my way of dodging the question," she replied, noticeably uncomfortable with discussing the topic.

Cabello, 17, and Mahone, 18, met around the time Fifth Harmony competed on FOX's music competition "The X Factor." The group then opened for Mahone on the last stop of his solo tour.

Rumors that Cabello and Mahone are dating have been circulating for over a year. In 2013, the "Shadow" singer was asked by MTV News about that speculation and denied it.

"She's a really, really cool girl, very nice, but we're not dating," said Mahone at the time.

However, the star has also posted pictures of him and Cabello on Instagram which have also seemed to verify their romance.