September 15, 2009 11:53 PM

Clearly still in their honeymoon phase, Heidi Montag celebrated her 23rd birthday with husband Spencer Pratt and a new addition to the “Speidi” family – a puppy!

Pratt surprised Montag Tuesday morning with a 9-week-old female maltipoo. “Spencer gave me the best gift ever, a maltipoo puppy that we have named Dolly,” Montag tells PEOPLE exclusively. The dog, named for country singer Dolly Parton, is white with black ears.

“I’m so excited today is my birthday,” Montag says. “Thank you God for every moment you have given me and blessing me with my wonderful husband!”

The reality starlet hinted about her desired birthday gift on Twitter last week, writing, “I really want to get a puppy!!!” on Sept. 10. Pratt must’ve taken note, because three days later, Montag was asking followers what to name her potential new pooch, fielding suggestions from fans including Angel, Lola, Whinny – and even Spencer Junior.

Later this evening the duo will continue the birthday celebration at their favorite restaurant, Wolfgang Puck’s CUT, inside the Four Seasons Beverly Wilshire hotel, where photographs of their faces adorn the restaurant’s wall.

Read about more Hills pups on PEOPLE Pets:
Hills Star Stephanie Pratt’s Animal Past: I Had a Rat!
Celebrities A-Twitter over Their Pets!

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