The Wanted star and father-of-two died on Wednesday at the age of 33, after battling an inoperable brain tumour.
Kelsey, who had been married to the star since 2018, announced his passing on Instagram, saying that her heart was “broken” and that she couldn’t imagine life “without his infectious smile and energetic presence”.
She has now started to share tributes from other people on her Instagram Story.
Kelsey wrote: “Love you. You knew how pure our love was, so pure and honest.
"Soul mates until the end.”
She posted another message from a friend who told how Parker had encouraged her to dance and shared messages they had sent each other.
Kelsey wrote: "This is... Tom Parker everyone... he changed so many lives in such a small amount of time.
"Tom Parker I F****** love you. Such a legend.
"Just the fact he would send messages like this... I mean can you imagine the messages I got.”
Parker was diagnosed with inoperable stage-four glioblastoma in 2020, while Kelsey was pregnant with their son Bodhi.
The couple already had daughter Aurelia, who was born in 2019.
The singer documented his cancer battle on social media and had shared his determination to beat the odds.
His bandmates - Max George, Siva Kaneswaran, Nathan Sykes and Jay McGuiness – have said they are “devastated” at the loss.
“Tom was an amazing husband to Kelsey, and father to Aurelia and Bodhi,” they wrote in an emotional message on Instagram.
“He was our brother, words can’t express the loss and sadness we feel.”
“Always and forever in our hearts,” they posted, adding: “Tom Parker 1988-2022.”
Watch: The Wanted star Tom Parker has died