Nicole Richie Preps Birthday Bash

New mom Nicole Richie picks up birthday gifts for her boyfriend, Good Charlotte frontman Joel Madden, in West Hollywood on Monday.

Joel and twin brother Benji turn 29 TOMORROW, March 11th.

The 26-year-old former Simple Life star shopped at Alpha: Gear for Gents and a party store to pick up some balloons and party favors. Nicole purchased birthday banners and also greeting cards that read “Pushing 30″ and “You’re the best dad ever and I’m not pulling you leg.”

15+ pictures inside of Nicole Richie prepping her husband’s birthday bash…