Danica Patrick crashed during the Coca Cola 600 on Sunday . . . and it was her boyfriend's fault.

On lap 319, Danica hit Brad Keselowski from behind, causing the two of them to wreck. But it turns out it was Danica's boyfriend, Ricky Stenhouse Jr., who forced Danica into Keselowski.

After making several pit stops to correct damage to her front end, Danica ended up finishing 29th. Keselowski finished 36th. Stenhouse finished 14th.

Keselowski initially took the blame, thinking he'd cut Danica off. He even apologized. But it was pretty obvious that Stenhouse was to blame.