DJ Steve Aoki, who produced the track, accompanied Tomlinson on stage.
Despite the emotional timing, Tomlinson performed live as per his mothers final wish.
Ive known you now for six years.
Credit: ITV
She was so looking forward to tonight.
Shes watching down on you now and youve done her proud.
Tomlinson agreed with Cowells sentiment later on Twitter.
Feeling so much love around me and my family, the 24-year-old said.
Mum would have been so fing proud ( sorry for swearing mum ).
That was harder than I ever imagined.
Just Hold On is now available oniTunesand for streaming on Apple Music andSpotify.
