Let's hope Joel Madden is ready for his big wedding day because we have to admit, he looks mighty worried.

The Good Charlotte frontman is walking down the well-protected aisle with his ladylove and mother of his two children, Nicole Richie. Joel seems focused on getting his last minute shopping done in Beverly Hills before this weekend's lavish ceremony ... set to take place at Lionel Richie's estate.

As for the vibe of the wedding, sources close to the couple tell us exclusively that Nicole and Joel have requested rental furniture from Revelry Event Designers with a "vintage and earthy" vibe. Also on the list of rentals ... "lots of wood pieces and leather."

Sounds rockstar chic ... perfect for the happy couple!