"Today felt like a great day to rescue a puppy..." she tweeted on Thursday. "Or two! I couldn't take a brother without his sister!"
Later she posted an adorable pic of one pup, captioned "Well...Ralph's already made himself at home #puppylove"
The Twilight actress has yet to announce the name of the female dog. The two new additions join her male fox terrier, Theo. Theo's sister, Marlo, sadly died in April when Ashley's West Hollywood condo went up in flames, reportedly due to a neglected candle.