Miranda Lambert is obsessing over her new hobby -- horseback riding.

 She's been taking English riding lessons since the first of the year and has been training at least two times a week. And she's getting ready for her first horse show in a couple of weeks.

Miranda recently posted this photo of her all suited up for the show on Instagram...

She's got three horses -- a Gypsy Vanner that Blake gave her for her birthday last year and two Welsh Cobs she recently purchased.