Jack Osbourne Shows Up at Estranged Wife's House Days After Punching Her Boyfriend

Jack Osbourne went to his estranged wife's house without incident Saturday ... this after a run-in days earlier in which Jack punched her boyfriend in the head.

Jack looked stoic as he walked up the driveway. TMZ broke the story ... Jack went to the family home last Monday at around 1 AM and ended up going after actor/model/boyfriend Michael Gabel, who apparently showed up after things got heated between Jack and Lisa Osbourne.

Cops showed up, but Gabel decided he didn't want to press charges, so the case was dropped.

Jack and Stelly are going through a divorce and at the time they announced their marriage was over they said they were trying to take a page out of the Gwyneth Paltrow/Chris Martin playbook, especially since they have 3 kids.