The 30-year-old pop singer posted the video and a photo of the baby on her Instagram.com page on Tuesday.
“My heartbeat. #Babyboss #Gwagon,” she captioned the photo. Harris is expected to marry her NFL quarterback boyfriend Russell Wilson sometime this spring or summer — if she can find a network to film her wedding for reality TV, à la Kim Kardashian and Mariah Carey.
The super couple got engaged earlier this month after dating less than a year.