Chrisean Rock says she’s a free woman … writing a message to her son, Chrisean Jr., all about how grateful she is to be back with him after her arrest in a drug case.

The rapper shared the tribute Friday … saying she’s feeling blessed to be with her son just days after his birthday — though she admits she regrets missing the first birthday of his life.

She says milestones are big markers of achievement when it comes to kids … but, people should also focus on the love and care they provide for their kids every day.

CR’s encouraging people to cherish every moment they have and trust in God … signing off with a thank you for all the fans praying for her during this difficult period.

Chrisean’s caption accompanied a sweet video of her and her son spending quality time together … with tons of adorable pics for fans to enjoy.

ICYMI … Chrisean was arrested back in June after walking into a Los Angeles area courthouse for a probation violation in the Tamar Braxton assault case. Adding to her legal woes, she was extradited to Oklahoma last month in connection to a drug case.

Prosecutors are accusing Chrisean of being in possession of controlled dangerous substances with intent to distribute, and failure to have a tax stamp affixed on the drugs. If convicted on both charges, she faces up to eight years in prison.

We’ve checked the inmate roster … and, Chrisean’s definitely out of jail in OK. Unclear why as of right now — but, we’ve reached out to Chrisean and authorities to clarity her case.