Niall Horan, Ariana Grande Dating Rumors: Big Sean's Ex-Girlfriend Parties w/ One Direction's Irish Heartthrob?

New photos of pop singer Niall Horan of One Direction and songstress Ariana Grande hanging out together have reignited more dating rumors than we can keep track of. Big Sean's ex-girlfriend was spotted hanging out with Horan once again, this time at a friend's group birthday celebration in Barcelona, which has us wondering why the Irish heartthrob went literally thousands of miles out of his way to spend time with the "Problem" singer. Perhaps they're really just friends, though! Read more on this news below.

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Check out Niall partying with birthday boy Alfredo Flores right here:

Meanwhile, Grande took to Twitter to celebrate Flores' birthday, leading everyone to think that she partied with Horan again:

We're not sure if this is "evidence," but what do you think?

Whether you want to believe this gossip or not is up to you, but Grande has been attempting to draw attention away from the latest dating rumors by making some bold, crass statements in response to the press.

"A girl can be friends with someone with a d**k and not hop on it. I'm tired of needing to be linked to a guy. I'm not Big Sean's ex, I'm not Niall's new possible girl. I'm Ariana Grande." The former Nickelodeon child actress told the Sun earlier this month, according to Daily Mail.

She wasn't done there, though. The pop singer penned an open letter essay about these recent gossip rumors and had her rep send it to HollywoodLife to share with those reading the tabloids.

"I am tired of living in a world where women are mostly referred to as a man's past, present or future PROPERTY/POSESSION. I .. do not belong. to anyone. but myself," she wrote earlier this month. "And neither do you. I have clearly not been having the boy questions in my interviews lately because I have come to the realization that I have SO. MUCH. MORE. to talk about [SIC]"

So Ariana is mad about all of these rumors, which haven't stopped since she's still hanging out with her pal Niall. Do you think they're just friends? Is Ariana's anger an act or should we take it as a genuine plea to leave her alone?