Danica Patrick was at Burning Man with a new man ... and based on the former driver's social media behavior Thursday night -- it's pretty serious!
Take a look at a carousel of pics the 42-year-old just dropped on her Instagram page ... while there were several snaps of her enjoying The Burn alone, there were two showing her getting awfully cozy with a hunky guy.
In the first one, Patrick could be seen smooching the dude in the dust.