Selena Gomez -- Back to Boozing After Rehab Stint

Selena Gomez is hitting the bottle hard after bailing from rehab just weeks ago.

Selena proudly re-embraced alcohol by posting this happy hour selfie on Instagram. We've confirmed there's booze beneath that whipped cream.

TMZ previously reported ... Selena checked into The Meadows last month to rid herself of alcohol, weed and Ambien ... and Justin Bieber. She bailed 2 weeks into the 45-day program to go to Sundance and then said she was cured so she didn't need to return.

Selena's rep claims she's got no problems handling her liquor. But when you're calling your cocktails "dessert before dinner" ... you may want to think about the next 12 steps.