ONE DIRECTION star NIALL HORAN has moved swiftly to reassure his young fans he's still single after rumors he had secretly married swept the Internet.

The Irish singer was stunned when he logged onto his account on Twitter.com on Tuesday (25Sep12) to discover dozens of messages from heartbroken female fans demanding to know if the speculation was true.

And he wasted no time in addressing the rumors on his page, writing, "Hahhaha I was gettin (sic) mentions and dm's (direct messages) last night askin (sic) me if I was married! Hahahahah heard it all now! People actually believe this stuff."