They rescued the puppy, Baylor, from a shelter in Winnipeg.
He's already an integral part of the family, helping her feel better after she got sick on tour. She tweeted:
"After 12 hours of medicine, tea, 1374 cans of soup and throwing up right when I get off stage ending my night with Baylor watching friends is perfect.
I can't thank you enough London for tonight I'm so sorry I was sick. I love you guys so much."
Selena and Justin are going to have to make sure to make some time for their new family member, between the tours and the constant making out.
[Image via Hugh Dillon/WENN.]