Parker, who spoke about her cancer diagnosis earlier in October, also has a 15 month old daughter with his wife, Kelsey Hardwick.
The 32-year-old singer is receiving treatment for grade 4 glioblastoma – an aggressive cancer that can occur in the brain or spinal cord.
His teammate Max George, who competes in the final round of Come strictly dance, announced the news of the baby in an interview Tuesday morning.
Speaking to ITV’s Lorraine, George said, “I spoke to him yesterday, he’s fine, he’s doing great.
“Kelsey gave birth to their second child last week. He’s a fighter, Tom. Tom will be fine.
“If he looks by the way, I love you all.” ”
The couple have yet to announce the news themselves, but have been praised on social media by fans and supporters, including charity Brain Tumor Research.
The life expectancy of people diagnosed with a glioblastoma tumor is around 12 to 18 months, according to the charity.
Parker is undergoing radiation therapy and chemotherapy in hopes of prolonging his life.
Writing on Instagram earlier in October, he said: “There’s no easy way to say this, but unfortunately I have been diagnosed with a brain tumor and am already in treatment.
“We decided, after a lot of thought, that rather than hiding and trying to keep it a secret, we would do an interview where we could lay out all the details and let everyone know the facts in our own way.
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“We are all absolutely devastated, but we will fight this to the end. We don’t want your sadness, we just want love and positivity and together we will raise awareness about this terrible disease and research all available treatment options.
“It will be an uphill battle, but with the love and support of everyone, we are going to beat it. ”
The Wanted was formed in 2009 with Parker, George, Siva Kaneswaran, Nathan Sykes and Jay McGuiness, and has had success with songs like Chasing The Sun and Glad You Came.
George was among thousands posting messages of support when Parker broke the news of his cancer, describing his teammate as “a brother, friend and bandmate” and praising his “incredible” bravery.