What have the guys in ONE DIRECTION been drinking on stage?!!
In a video from their concert in Louisville on Sunday, 21-year-old LOUIS TOMLINSON and 19-year-old NIALL HORAN APPEAR to drink something other than water from their water bottles...
Whatever they had in the bottle WAS clear . . . but when they took a sip, they reacted like it was MUCH MORE than water...
Niall responded to this yesterday by Tweeting, quote, "No way is that true! Ever, Ever! Who is making this [crap] up?"
Then three minutes later . . . after he'd apparently watched the video .
. . he posted another Tweet that said, quote, "Now I get why people are saying it. Me and [Louis] do that every night! [We] pretend there's something in the water bottles."