"Heading to Pittsburgh to see Mikey! It has been a month! Bad wifey!" Duff Tweeted last week. "Can't wait ... kind of dread this plane ride! ALL worth it though!" A few days later, she shared pics of them standing beside a towering elephant and a pair of giraffes. She wrote, "Best day at the pittsburgh zoo! staff was good too us!"
The animal encounters didn't stop there. In fact, her husband, who plays for the Pittsburgh Penguins, might be a tad jealous of one of the friends his wife made during the visit. Along with a pic of her stroking a friendly bird, Duff Tweeted, "I have a crush on a penguin!"
See more celebrities on PEOPLEPets.com:
Patrick Dempsey's Animals Have a 'Profound' Effect on His Kids
Mwah! Julianne Hough's Pre-Gala Pooch Smooch