Heidi and Spencer have added a new member to the Pratt brood — a maltipoo named Dolly.
According to Heidi, the pup was a present from her husband for her 23rd birthday on Tuesday.
"I'm so excited today is my birthday. Thank you, God, for every moment you have given me and blessing me with my wonderful husband," she added.
Spencer also Tweeted his birthday wishes to his wife.
"HAPPY BIRTHDAY @HEIDIMONTAG!!!! I LOVE YOU WITH EVERY CELL IN MY BODY!!!! THANK YOU GOD FOR MAKING HEIDI TODAY 23 years ago!!!" he wrote.
Heidi and Spencer wed this past April and already rumors are circulating regarding a different kind of addition to the household — a baby.
MTV released the trailer for the upcoming Season 5 of "The Hills" which revealed a very baby-conscious Heidi.
In the clip, Heidi tells Spencer's sister, Stephanie Pratt, "I'm wife now. I need to step up my wifely duties… I saw the cutest baby ever."
Additionally in the teaser, during a dinner where Spencer says, "We're twenty-two, yo," Heidi responds with, "So we should probably get started soon. Women have expiration dates."
Related Content from AccessHollywood.com:
PLAY IT NOW: The Bitch Is Back On 'The Hills'
PLAY IT NOW: Heidi Montag Clears Up Misconceptions & Rumors (August 21, 2009)