In the wake of the death of Louis Tomlinson's mother, Johannah Deakin, who tragically passed away after losing her battle with leukemia on Wednesday (December 7), the singer's former fellow One Direction band members have rallied behind him on Twitter.

After hearing of Deakin's passing, which was announced by her husband on Friday (December 9), One Direction stars Zayn Malik, Niall Horan and Liam Payne, as well as the band's co-creator and mentor Simon Cowell, shared their condolences and words of brotherhood and support on social media.

Malik was the first to react on Twitter, writing to Tomlinson, "Proud of your strength and know your mum is too."

Payne and Horan also tweeted words of love, while Cowell, "heartbroken," reminisced about what an "incredible person" Deakin was.

Harry Styles has yet to publicly comment on Deakin's passing.

See Malik, Horan, Payne and Cowell's emotional tweets, below:

One Direction Through the Years:

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