Mama June: Got a Case of the Blues ... Back in Jeans!!

Mama June has hard evidence she's trimming down her waistline ... she's back to wearing blue jeans!

We got June arriving at LAX with a friend, and while it was clear she'd continued her pattern of dropping lbs -- we didn't know just how much ... until her friend pointed out June's new wardrobe.

The "Here Comes Honey Boo Boo" matriarch was rocking some distressed denim, and says it's been years since she zipped up a pair.