One Direction's Niall Horan is seemingly getting serious with rumored girlfriend Melissa Anne Whitelaw, as he was once again spotted hanging out with over the weekend.

According to The Mirror, the couple pretty much confirmed their romance, arriving together at the Libertine nightclub in London just after 1 a.m. They were also photographed leaving the venue together at 3 a.m. The Irish star reportedly first met the 21-year-old Australian student at a casino in Oz, where his band was on the "On the Road Again" tour.

"OMG Niall Horan and Melissa. They were seen in a casino, they kissed," one fan supposedly tweeted at the time. "And he held her by the waist and playing with her hair."

Whitelaw then broke her silence on dating Horan, taking to her Instagram account, @edgeofmydesire.

"For all you asking yeah Niall and I dating. Niall has not posted about because we have decided we will wait until it's the right time," she wrote the caption, via Ocean Up.

The brunette beauty also attended Trekstock's Great Gatsby-themed charity ball with the "Steal My Girl" crooner, which was allegedly arranged by the latter's bandmate Liam Payne's girlfriend Sophia Smith.

A source told The Mirror that Whitelaw that she has met the rest of the band, and the other men consider her to be Horan's girlfriend. The source added that the pair seemed to be serious about each other by the way Horan was introducing Whitelaw to his people, and his friends gave her their seal of approval.

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