08/14/2012 AT 9:00 AM ET
Luca Cruz Comrie’s reign as one of Twitter’s leading celebs continues.
“Luca is cutting a tooth!!!” Duff Tweeted last Thursday. “It’s the cutest/saddest (because it hurts) getting so big my boy!! Gunna have a little toof lol.”
Duff, 24, also Tweeted a pic of Luca munching on a “Tasty toy” earlier this month, during what appeared to be his pre-teething stage.