Josh Duhamel and his wife Fergie are in mourning following the death of their beloved dog.
 
Meatloaf, who featured on the couple's Christmas cards, passed away on Sunday, and the Transformers star has paid a touching tribute to his canine pal on Twitter.com.
 
The actor writes, "He was one of the kindest sweetest souls I've known. He'll be missed. RIP little buddy."
 
The heartbroken Black Eyed Peas star retweeted the message to her followers.