One Direction Star Louis Tomlinson's Mother Johannah Dead at 43

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Louis Tomlinson is mourning the death of his mother, Johannah Deakin.

Deakin died on Wednesday, Dec. 7, after being diagnosed with an aggressive form of leukemia earlier this year. Deakin had seven children total -- 24-year-old Tomlinson being the eldest -- and is also mourned by her husband, Dan Deakin. She became a grandmother in January, when Tomlinson welcomed his son, Freddie, with stylist Briana Jungwirth.

"Johannah was first and foremost a truly amazing mother to seven children -- Louis, Lottie, Félicité, and two sets of twins, Phoebe and Daisy and Ernest and Doris -- whose individual talents and success are testament to the principles and beliefs she instilled in them," Deakin's husband said in a statement to ET on Friday. "She was also an incredibly proud grandmother to Freddie."

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"Incredibly selfless, she would always look to put other people before herself," the statement continues. "She desired nothing more than for everyone around her to be happy and loving. She worked tirelessly on numerous charity campaigns, creating memories for many individuals and their families. It wasn't uncommon for Johannah to hear through the media of an individual in need of assistance, and she would immediately make it her objective to get that person what they often desperately needed, and rarely without success. These are the things that made Johannah happy and content in life, and all of which for me made her simply the perfect wife and best friend to face each day with. I thoroughly loved walking through life with her, and though five years was far too short a time, during that time we had so many lifetimes worth of happiness, adventures, and memories."

The family also thanked University College London Hospital, where Deakin had been hospitalized since May.

Tomlinson is continuing with a pre-scheduled performance on The X Factor this weekend as a tribute to his mother, whose wish was for him to continue.

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Just two weeks ago, the One Direction singer Intagrammed a sweet throwback pic of him with his mother.

"My mother looking gorgeous before the Brits earlier this year," he wrote." I love you and miss you so much!"