Klum takes her exuberant children Leni, 5, and Henry, 3, for playtime in an N.Y.C. park. Halle & Nahla, Lauren Conrad, Reese Witherspoon and more

BACK TOGETHER

Bradley Cooper captures Julia Roberts's attention Tuesday on the Los Angeles set of their new movie, Valentine's Day. The romantic comedy is a reunion for the pair, who costarred in the 2006 Broadway show Three Days of Rain.