Miley Cyrus & Liam Hemsworth Adopt a Fourth Dog — Meet Happy!

When it comes to Miley Cyrus, too many dogs is never enough! The singer took home another puppy yesterday, a possible Rottweiler-Beagle mix whom she named Happy.

OK! GALLERY: LIAM HEMSWORTH SHOWS OFF HIS MUSCLES WHILE LEAVING THE PET STORE 

"He was left in a box in front of Walmart," Miley Tweeted today. "I don't understand how people can be so cruel. That's why we named him Happy." Aww, how sweet is that? 

Miley Tweeted four photos of the new addition to the Cyrus-Hemsworth brood, even posting one of Happy laying on luxurious leather, writing, "From cardboard to Margelia." (Referring to designer Martin Margelia). 

OK! NEWS: MILEY CYRUS GETS LIAM HEMSWORTH A PUPPY FOR HIS BIRTHDAY — MEET ZIGGY! 

Funny enough, Liam Hemsworth was spotted running to the pet store yesterday, picking up another puppy bed and two large bags of dog food... and now we know why!  "Happy & I getting "groomed" by @glennnutley," Miley Tweeted this afternoon, adding a photo of her and her new pal in the salon. Happy joins Miley and Liam's other dogs, Lila, Floyd and Ziggy. Congrats to Miley & Liam on their new addition!