"Extra" caught up with funnymen Will Ferrell and John C. Reilly at the L.A. premiere of "Step Brothers" -- where the co-stars dished about their naked antics on set, and actress Mary Steenburgen who plays their onscreen mom. Also, find out what John reveals about Will's spending habits!

Don't miss any of the brotherly love in "Step Brothers," which hits theaters July 25th.

Click on an image to view the "STEP BROTHERS" PREMIERE photo gallery!