Gwyneth Paltrow hopped into a waiting car in London yesterday. She was spotted solo after spending Saturday with her son, Moses, and his friends at Legoland. Moses turns 5 on Friday, but he's not the only celebrity kid to have a milestone this month. Suri Cruise will also celebrate her fifth birthday in April, and Katie Holmes chatted about her big party plans last night on Jimmy Kimmel Live. The Cruise-Holmes family already kicked things off with a barbecue over the weekend, and perhaps Gwyneth will continue Moses's celebrations with her own home-cooked meal. She's all about making food for her guests, and she'll share special recipes in her new cookbook, My Father's Daughter, which comes out in a few weeks. Gwyneth is apparently taking her love for cooking to the next level since she's in talks to start her own magazine on the subject.