The 40-year-old announced the happy news of her pregnancy on Britains Got Talent in May when show hosts Ant McPartlin and Declan Donnelly performed a musical opening number, during which they sang Alesha is expecting.
The crowd erupted into applause at the news and fellow BGT judge David Walliams jumped to his feet to cheer.
The baby will be Aleshas second child, as she already has a five-year-old daughter called Azura Sienna.
Its great the first time around, you read every single book going and the second time youre like, Ive got this.
When is pregnant Alesha Dixon due?
Although Alesha announced her pregnancy back in May, the former Mis-Teeq singer has kept her due date a secret.
This is also what the star did when she was pregnant with Azura, only announcing her birth a week after she welcomed her little girl with a surprise tweet which read: Thank you for all of your lovely birthday messages! Ive had the best present in the world………, she teased, adding: My baby girl Azura Sienna was born last week!!!
My baby girl Azura Sienna was born last week!!! I'm elated and over the moon x x x x x x x x x x x x x x x x x x x x x
— Alesha Dixon (@AleshaOfficial) October 7, 2013
When many of her followers commented on the sudden arrival, Dixon replied: It seems quick because I was hiding it for so long!!! I was in my 6 month of pregnancy at the Britains Got Talent final! xxx.
If Alesha was further along than fans realised when she was pregnant with her first child, could the BGT judge be closer to her due date than everyone realises with her second baby?
And after her pregnancy announcment, will the star enlist the help of Ant and Dec to announce the birth as well? Only time will tell.