1D's Louis Tomlinson: Harry Styles pulled the most girls during Up All Night tour - but we don't keep a tally
'Do I even need to say who?' asks Louis, 20.
'I think it would be completely and utterly unfair to single out girls in that way, or put it like that.
'But...if you were to put it like that, I think it would - possibly - be...Harry.'
Louis and Liam Payne, 18, are happily loved up with their girlfriends so behaved themselves while supporting Big Time Rush earlier this year.
1D are all now back in the US again for a headline tour - but Louis insists they won't be counting the boys' conquests.
'Do we keep a tally? No we do not!' Louis tells the Daily Mirror.
Though Zayn Malik is now dating Little Mix's Perrie Edwards, Louis confirmed that Harry's no longer going out with Inbetweeners star Emily Atack, 22, who he was recently reported to have fallen for.
VIDEO: Harry Styles supports Cancer Research UK
VIDEO: One Direction coming soon
VIDEO: Teen Now meets One Direction part 1
VIDEO: Teen Now meets One Direction part 2
VIDEO: Capital FM Jingle Bell Ball part 2 with One Direction