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Louis Tomlinson's mother would be so proud. 

The One Directionartist returned to the stage just three days after saying goodbye to his mother, Johannah Deakin, who lost her battle with leukemia on Wednesday at the age of 42.

Tomlinson was joined by DJ Steve Aoki for their brand new collaboration "Just Hold On," which marks the 24-year-old's very first single as a solo artist. At the end of his performance, Louis was met with an incredible standing ovation and some kind words from former mentor and X Factor judge Simon Cowell

"What you've just done, and the bravery. I respect you as an artist and I respect you as a person. Your mom was so proud of you Louis; she was so looking forward to tonight," Cowell told Tomlinson, who was fighting back tears.

"She's watching down on you now and you've done her proud," Cowell added. 

Louis Tomlinson, Mother Johannah Poulston

Stuart C. Wilson/Getty Images

E! News reported Friday that Louis would indeed go through with his X Factor performance, despite his sudden loss. 

Some of Tomlinson's bandmates took to Twitter shortly after to offer their heartfelt condolences. Niall Horan wrote, "Very sad news . Louis I love you mate and I'm / all of us are here for you all the way . You're mum was an incredible person . Thinking of you and your family .love from my family to yours.."

Liam Payne shared his own lengthy message to his grieving pal that read in part, "Louis, I'm so sorry for you my brother my heart aches for you, just know I love you from a million miles away as I do right next to you..."

Former 1D member Zayn Malik expressed his own sympathy, writing to Louis, "love you bro! All of your family is in my prayers. proud of your strength and know your mum is too x"

Since its Friday release, "Just Hold On" has already shot to the No. 1 spot on iTunes charts. Congratulations to Louis on a performance well done!