Anderson announced on her Instagram: "Our hearts are full. Baby Lucy due Summer ‘23."
Lucy confirmed to The Sun that he and Anderson were no longer a couple saying: "I love Laura but we are no longer together. My main drive as always is to work together to co-parent our child. I look forward to the arrival of the new baby."
She shared a montage of her growing baby bump and attending an ultrasound scan with Lucy.
Anderson sparked speculation she had split form Lucy in January when she deleted past posts which featured him and appeared to unfollow him on Instagram.
She shared: "I know I've been quiet on here and not myself this week or so. "I'm going through a very difficult time, I actually don't think I've ever felt so stressed in my life."
The couple met on 12th series of Celebs Go Dating which aired in November 2022.
He split from wife Natasha Gray, his partner of 14 years, in 2018 when she was pregnant with their fourth child.
Anderson was runner-up in the 2018 series of Love Island.
She then dated Another Level singer Dane Bowers for four years.
Lucy declared himself "lucky to be alive" after being involved in a car crash on Boxing Day 2022.
He was treated in hospital but fortunately had no serious injuries after crashing his black Range Rover, completely smashing the front of the car.
Watch: Laura Anderson said taking part in Celebs Go dating was like therapy