Joel Madden sweetly kissed Nicole Richie on her head as they made their way into an EcoMom party at a home in the Hollywood Hills last night. She wasn't wearing her House of Harlow headwear, but Nicole's bump was more apparent in her flowing maxi dress and her dad-to-be again boyfriend looked smitten as ever. The night before was Joel and his twin Benji's 30th birthday and they all celebrated together, but that didn't stop Nicole and Joel from hitting the town again on Thursday night.
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