Stars and Their Pets: Hilary Duff's Birthday BundleDuff spends her special day in L.A. with sister Haylie and Chihuahua Lola. Plus: Ryan Reynolds brings Baxter to the park in Boston and more

JEREMY RENNER

The Avengers hunk proves there's nothing wrong with a big man having a little pooch during a walk in New York with his bulldog on Tuesday.