The star's Maltese dog Gucci — which was her first dog as a child — has passed away at age 15 in Long Island, according to E! Online.
On April 2, Lindsay's mom Dina tweeted the sad news:
The Mean Girls star was headed back to the U.S. today after a promotional stint in Brazil, so this will be tough news to come home to.
We wish Lindsay and her family all the best during this sad time.
Source: E! Online