TMZ Live

Justin Bieber's BFF Lil Za had a better chance of fighting a jail cellmate than taking on an opponent in a boxing ring -- but the guy's turned his life around, and now he's throwing KO punches.

Za got pretty famous for getting in a ton of trouble with Bieber over the last couple of years -- he was busted for drugs during the infamous egging raid in Calabasas. The 21-year-old tells us, "When all that madness was going on, I decided to grab a hold of myself and do something positive."

Za's been training hard for the last year, and as you can tell from the video ... kid's got some skills. He came on TMZ Live to tell us about making the big change.

Devo singer Jerry Casale says he was as surprised as anyone when he saw his wedding cake in the shape of the Twin Towers and place setting with box cutters.

The newlywed was on "TMZ Live" Monday... where he said one of his friends was behind the lamebrained idea.

Caitlyn Jenner's transition completely blindsided comedian Jeff Dunham -- one of her homies from her Bruce days -- and he's revealing how he finally got the picture.

Dunham was on TMZ Live Thursday ... responding to Caitlyn recently calling him out for avoiding her. Jeff says he doesn't have any issue with Bruce becoming Caitlyn. In fact, he says even though he noticed a few plastic surgeries over the years ... he NEVER suspected what was really happening.

But JD says he finally raised it with Jenner after one particular magazine cover. You gotta hear how the convo went down, and how Jenner broke the news.

As for reconnecting with Caitlyn -- Jeff says it's gonna happen soon, and it's a scheduling issue, and NOT about awkwardness.