Lambert also posted a photo of a billboard from her hometown of Lindale, Texas, which wished the "Mama's Broken Heart," singer a happy birthday.
"My sweet hometown," Lambert captioned the photo. "Thanks Lindale Texas for supporting me always and giving me a place to call home!"
Yesterday, the country singer posted a photo on Instagram of an early birthday celebration, where she and her friends decorated her horse to look like a unicorn.
"Never too old to ride a unicorn," Lambert captioned the photo. "And thank God for friends that spend the day with you painting your pony! #32tomorrow #bday #unicornsarereal #sophie #gypsyvanner #glitter #reallifelisafrank."