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ET has learned that Marston Hefner, Hugh Hefner's son, was arrested on Sunday night in Pasadena, California in response to a call of a "suspected domestic violence battery".
According to the Pasadena Police Department, Marston's girlfriend Claire Sinclair was found to have minor injuries.
On Monday, the 22-year-old Playmate tweeted, "There's two types of pain in the world -- pain that hurts you, and pain that makes you stronger. All of your positivity is giving me strength."
Hugh Hefner reacted to the arrest in a quote to People, saying, "If they care about each other, they'll patch it up."
Marston was booked and later released after posting a $20,000 bail.