GOSSELIN + BABYSITTER = TROUBLE!

Jon Gosselin just can't keep his hands off the ladies — even if they are employed to babysit his kids!

RadarOnline.com reports Jon's latest love interest is 23-year-old single mom Stephanie Santoro, one of his children's babysitters! The cocktail waitress/aspiring model spent Saturday night at Jon's apartment over the garage at the Gosselin family home in Pennsylvania.

Jon and Stephanie were spotted going home together around 3 a.m. and were not seen again until approximately 7:15 a.m. Sunday morning!

Click here to see the exclusive photos and read more about Jon's brazen hookup at RadarOnline.com.