A number of US retailers broke LittleBigPlanet Vita's street date over the weekend.
Sony Computer Entertainment America PR manager Eric Levine said early buyers will be able to enjoy the game's single player features, but that online elements won't be enabled until the official LittleBigPlanet Vita release date later this week.
"Production on LittleBigPlanet PlayStation Vita was completed earlier than expected, and due to the excitement from our retail partners, some have decided to put it on shelves as soon as the product was received," he explained.
"You'll still be able to fully enjoy all the offline features of the game, but the servers will not go live until September 18. We apologize for any confusion this may cause and will keep you posted on any further updates."
We said in our 9.2/10 LittleBigPlanet Vita review: "Simply, the best LBP on any format. Combines smart design with Vita's controls, and adds incredible online functionality to make it the first essential Vita game."