The former Nickelodeon star announced the happy news via Instagram on Saturday.
“Guesssss what??????” she captioned a photo of her now-fiance and herself holding up her left hand to reveal her new sparkler.
She later added a close-up shot of her beautiful diamond ring with the caption, “He did good.”
This will be the first marriage for the former “Zoey 101” actress.
Jamie Lynn has a 4-year-old daughter, Maddie, from her previous relationship with Casey Aldridge, whom she split from in 2010.