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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There's no "back-to-school" for the Jolie-Pitt kids, per se. Since they're seasoned jet-setters, Maddox, Pax (who's hidden under the giant purple bear), Zahara, Shiloh, Vivienne and Knox are home schooled throughout the year.

Here they are with mom, Angelina Jolie, touching down at Sydney Airport, Sydney Australia, Thursday. And look how big they're all getting. Yes, that's Maddox in the back, there!

Read more: Adoption and the celebrity families we love>

Here's beaming Draft Day actress Jennifer Garner picking up her daughter Violet after her first day back at school, Tuesday, in Santa Monica, California. Sweet!

Photos of Beyonce and her baby girl, Blue Ivy, are quite rare. Check out this lovely pic of her and Blue boarding a yacht in Ibiza, Spain, on Labour Day Monday. 

Devil's Knot actress Reese Witherspoon and her little guy, Tennessee, were snapped going out for lunch at the Belwood Bakery in Brentwood, California, recently. What a cutie!

Read more: Hollywood's newest babies>

Ben Affleck was all smiles Labour Day Monday, as he took his daughters, Seraphina and Violet, for lunch and a frozen yogurt in Santa Monica, California. 

Read more: Hollywood couples: Still going strong>

Here are Heidi Klum and her girls, Leni and Lou, leaving Target after some back-to-school shopping, in Westwood, California. Her boyfriend, bodyguard Martin Kristen, and the boys, Henry and Johan, came along, as well.

Read more: Celebrities who have lots of kids>

Actress Alyssa Milano's son, Milo Bugliari, is only two — so this is just another week for him, of course. He and his mom are photo'd here enjoying a ride at the farmer's market in Studio City, California, on Labour Day weekend.  

Read more: Former child stars all grown up>

And this is what Labour Day looks like for Jessica Alba and her youngest daughter, Haven — on their way to the beach with the family, in Malibu, California. Cool shades!

They're so grown-up now! Here's Madonna and her youngest kids, Mercy and David, holding hands while catching a flight to New York at Heathrow Airport, in London, England, earlier this week.

Fitness superstar Jillian Michaels and her daughter, Lukensia, were spotted enjoying Labor Day at the Malibu Kiwanis Chili Cook-Off, in Malibu, California. 

Read more: Special interview with Jillian Michaels!

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