On Monday, the 25-year-old mom hit the red carpet for the premiere of Disney's "Planes" at the El Capitan Theatre in Hollywood with her adorable 1-year-old son, Luca. Duff's thigh-high shorts were part of her black silk Maje romper that hopefully kept her cool in the heat. She paired the look with a statement necklace and some beige ankle booties.
The former "Lizzie McGuire" star has been sharing snapshots from her summer outings with her 3.4 million Twitter followers. Last week, she shared a selfie of her rocking a bathing suit while relaxing on a boat. On Aug. 1, she took a photo with husband Mike Comrie and some friends at the LA Dodgers game.