In an emotional on-stage moment, Jessie J revealed at her Monday night (Nov. 12) show in London at the Royal Albert Hall that she cannot have children naturally.

The 30-year-old told the crowd she discovered she had fertility issues four years ago and detailed her "pain and sadness" before performing the song "Four Letter Word" -- a track she wrote specifically about the subject as a means of finding some solace and helping other people in the same situation.

"I don’t tell you guys for sympathy because I’m one of millions of women and men that have gone through this and will go through this," the "Domino" singer opened up in video of the moment posted by fans. "It can’t be something that defines us but I wanted to write this song for myself in my moment of pain and sadness but also to give myself joy, to give other people something that they can listen to in that moment when it gets really hard."

"So if you’ve ever experienced anything with this or have seen somebody else go through it or have lost a child, then please know you’re not alone in your pain and I’m thinking of you when I sing this song," she said.

The singer's reported boyfriend Channing Tatum was also present at the London show.

Watch fan footage of the emotional moment below.