NASCAR driver DANICA PATRICK is single.  In a Facebook post, she announced she's divorcing her husband Paul Hospenthal.

She said, "I am sad to inform my fans that after 7 years, Paul and I have decided to amicably end our marriage.  This isn't easy for either of us, but mutually it has come to this.  He has been an important person and friend in my life and that's how we will remain moving forward."

Hospenthal is a physical therapist, and they met when he was helping her rehab a hip injury.  He's 47 . . . Danica is 30.