Taking it back to the Disney star's birthday, Twitter exploded by the minute as soon as Horan sent out a birthday greeting to her which went: "Happy birthday honey! See ya soon."Lovato has also apparently addressed her feelings for Horan and how he would be her ideal partner."He has a lot of great qualities.
Previously, they had claimed to keep contacts through video chats over Skype.
They were also spotted having an "intimate" dinner at Pink Taco after the MTV VMAs in Los Angeles on 7 September.
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The pair have always insisted on being friends but the #Directioners still aren't 100% convinced.