Justin Bieber and Hailey Baldwin Bieber are celebrating a new milestone in their marriage.

The love birds honored their fourth anniversary as a married couple on Tuesday.

The Peaches singer shared a black-and-white selfie of him and his wife getting cozy with a cute puppy to commemorate the special milestone.

Happy anniversary to my best friend and wifey @haileybieber... thanks for making me better in every way, the 28-year-old wrote on Instagram .