louis tomlinson
The One Direction star's sister Felicité died earlier this year, at the age of 18.
The Strip That Down singer said he and Louis "absolutely hated each other" when things were at their worst.
The 18-year-old was found dead at her London home back in March.
Earlier this week, Directioners celebrated the band's ninth anniversary.
Euphoria featured a fan-fiction scene showing Harry performing a sex act on Louis.
Louis Tomlinson Helps 83-Year-Old Friend Cross Some Things Off His Bucket List In Heartwarming Video
Richard's bucket list included riding in a helicopter and getting a tattoo.
There's no denying last year's series was a low-point for The X Factor.
Louis had been due to perform on the show before the death of his sister.
"You're not on your own... So many people are pulling for you and your family right now."
The Instagram star died at her flat in central London.