Furry, four-legged friends make Miley Cyrus go weak in the knees!

This week, the 19-year-old starlet took in an abandoned puppy, which she found on the street.

"He was left in a box in front of Walmart. I don't understand how people can be so cruel. That's why we named him Happy," she explained to her Twitter followers on Wednesday.

"He's a little boy. We're not 100% on the breed, but we think Rottweiler Beagle mix :)" she added of the adorable pup.

The "Party in the USA" singer's new addition joins her brood of dogs Lila and Floyd -- plus Ziggy, the pooch she gave to beau Liam Hemsworth in January for his 22nd birthday. Throughout the day, she proceeded to make sure the pint-sized pooch received A-list treatment.

"From cardboard to Margiela," she tweeted under the pic below, referring to the pricey, luxe line of clothing, accessories and shoes sold at retailers like Saks Fifth Avenue and Net-A-Porter.

Later, the duo sat for some pampering. "Happy & I getting 'groomed' by Glen Nutley," she happily tweeted.