"16 and Pregnant" star Whitney Purvis was arrested in Georgia yesterday ... after cops say she tried to shoplift a pregnancy test from a local Walmart.
According to the police report, the 20-year-old MTV star stashed the pregnancy test in a hooded jacket and then tried to make a break for the exit.
Purvis' plan didn't work ... she was nabbed ... and hauled to a nearby police station where she was booked for misdemeanor theft by shoplifting.
Purvis was featured on the MTV show in 2009.