The former Top of the Pops presenter has named her new arrival Hunter. The little boy weighed in at 8lb, 5oz.
Sarah - who is engaged to TV producer Andy Merry - announced the news saying:
"When can I have a gin? It's been nine months.
"Andy and I are thrilled and slightly terrified at the thought of taking a new member of our family home with us. Hunter is a beautiful, healthy baby boy with long legs, just like his dad."
On Monday Sarah hinted she was about to pop, tweeting the message:
...just off to HAVE A BABY sometime soon.... Last thing to tick off this week's To Do list;)- Sarah Cawood (@sarah_cawood) March 26, 2012
Sarah suffered a miscarriage last year, and is due to marry Andy later this year, making 2012 a thoroughly eventful year for the new family.
"Our plan has come together - to have a baby, then get married," says Sarah. "2012 is proving to be the most exciting year of our lives!"
Congratulations Sarah and Andy!
What do you make of their name choice?