Jessie J hit the stage for her first performance after having surgery at Radio 2 In the Park on Saturday (September 6) in Chelmsford, England.

The 37-year-old singer marked her first time back on stage performing, eleven weeks after undergoing surgery for breast cancer, which she revealed an early diagnosis in early June.

Jessie wore a shiny white outfit and even brought her son Sky, 2, on stage with her. In fact, it was his first time watching her perform on stage!

During her set, Jessie shared a message about her diagnosis and living her best life.

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"Some of you may know, some of you may not know, but I had breast cancer surgery 11 weeks ago today," she said, via Daily Mail. "And the last show I did, I had no idea what was gonna happen, and I'm still very much in the recovery process, but I'm definitely not ready for Babins."

"I mean, I am, but my doctors are like 'calm down, girl.' Do you know what I mean, you can take the girl out of Essex, put her back in to Essex," she continued. "But I'm just so grateful to be here, you have no idea how grateful I am to see so many of you singing along after all these years. It truly feels like I'm a little kid, still doing what I love."

Jessie also performed her song "Living My Best Life," which was released two weeks after her diagnosis.

"Some of you may know it, some of you may not know it, but what this song's about, I was diagnosed literally two weeks before this song was released, and everyone said, 'let's stop, let's just put everything on hold,' and I said, 'That's not what life's about,'" she told the crowd. "Life is about standing in the storm but holding up your umbrella and just keep moving forward. And music, I don't know about you guys, but for me, music is a healer. Music is the thing that keeps me wanting to wake up in the morning and just makes me excited about life."

"And I'm grateful that I can make music that can give other people something that they might need on a hard day or a good day," she added. "So this song is called Living My Best Life, and that is what I'm doing every single damn day. 'Cause we never know when our last day will be, so soak this up, hug the people you love hard."

Just last week, Jessie announced that she had to cancel her US tour and postpone the European dates as she has to go in for a second surgery before the end of the year.