The tiny tot appeared to be getting to grips with his dining etiquette on Saturday (28 September), but hadn't quite mastered how to keep his food on his plater yet - although he still looked adorable trying.
Anna - who is probably best known for her role in the successful Scary Movie films - upoaded the picture showing Jack sitting at a table covered in food and playing with his plate, which was turned upside down.
She captioned the snap: "So awesome my child can feed himself-now I can go back to bed."
Anna, 36, gave birth to little Jack in August last year.
Jack's father is actor Chris Pratt, who married Anna in an intimate ceremony in Bali in 2009 after meeting her on the set of the romantic comedy, Take Me Home Tonight.
Being stars of the big screen no doubt comes in handy when the happy couple want to entertain their son, as they can easily amuse him with role playing and funny voices.
In fact, Anna is sure to score points with Jack when he is old enough to watch films, as she has recently lent her voice to characters in popular kids movies such as Yogi Bear and Cloudy With A Chance Of Meatballs.
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