(nowmagazine.co.uk) - Nicole Richieis said to be thinking about going back to work, despite only giving birth to her daughterHarlow3 months ago.The Simple Lifestar was spotted leaving an audition in California clutching a script. But friends of the socialite think she's at her best when she's being a full-time mum. 'Nicole is thrilled with the way things are in her life,' the pal says. 'She couldn't be happier.' Meanwhile, fianceJoel Madden, 29, has been keeping touch with baby Harlow via phone while he's away on tour with rock bandGood Charlotte.