Meghan donates to Childhood Cancer Foundation

Christmas came even more brightly this year for JoJo Siwa and her Childhood Cancer Foundation.

Meghan donates to Childhood Cancer Foundation

The Time 100 honoree, 18, was graced with the organization's biggest donation yet as she filled in last week as a guest host on The Ellen DeGeneres Show, having her pal Meghan Trainor appear with her on Wednesday's episode.

Meghan donates to Childhood Cancer Foundation

"I watch your show every single day, but I watched the episode where you talk about the JoJo Siwa Childhood Cancer Foundation, and I worship you," Trainor, 28, raved.

Meghan donates to Childhood Cancer Foundation

"I've met a lot of fans who are going through that with their family members. It's very hard, and so, I appreciate you so much for doing that, and I'm so beyond proud of you and I worship you. And I wanted to make a donation."

Meghan donates to Childhood Cancer Foundation

Trainor then presented Siwa with a massive check for $100,000, which quickly brought Siwa to tears. "I'm not crying, I swear," the Dance Moms alum joked.

Meghan donates to Childhood Cancer Foundation

"It's been a solid 12 hours since I've cried, but this means so much. Thank you! This is going to help so many kids. I had no idea about this, I'm so caught off guard," Siwa continued.

Meghan donates to Childhood Cancer Foundation

"This is the biggest donation that we've had yet to the charity."

Meghan donates to Childhood Cancer Foundation

Siwa launched the non-profit earlier this month, explaining that it was "something I've been wanting to create for YEARS."