Jessica Simpson celebrated her fiancé Eric Johnson's 33rd birthday yesterday at lunch with him and their friends. The group sat down for a meal at the Santa Monica hotel Shutters, and Jess was seen arriving for the get-together in a pair of denim cutoffs and sky-high heels. The happy new parents left baby Maxwell at home, but the little one's been a big part of the celebrations lately. Earlier this week, Jessica shared new photos of Maxwell Johnson, including one with Eric beaming as he held the infant. Jessica loves watching Eric with baby Maxwell, and spoke about their bond with iVillage. Jessica said, "The way he loves her, and the way he kisses her on the head — you can just tell that he wants to protect her. It's made our love deeper, and I know that Maxwell's gonna be a daddy's little girl just from watching the two of them interact."