Back-to-school: Best celebrity kid pics of the week

It's back-to-school week! From school drop-offs to exploring the farmer's market, Labour Day fun, catching a flight or just plain hanging out, here are some of the best pics of the week — starting with the woman of the hour, since everyone's buzzing about her pregnancy, Gwen Stefani. 

The pregnant singer is photo'd here dropping off her adorable son Zuma at school in Los Angeles, California, earlier this week. Cute!

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