Wladimir Klitschko, Hayden Panettiere Share Baby's 1st Instagram

— -- Hayden Panettiere and Wladimir Klitschko celebrated the brand new year with their brand new baby.

The world heavyweight champ posted their baby's first Instagram, a candid shot of Panettiere and their newborn daughter, Kaya Evdokia, along with the hashtags "#newyear" and "#family."

“We are over the moon and madly in love," the couple told People magazine, following the birth of Kaya Dec. 9.

She's been an easy baby despite a few restless nights and what the nursing mom calls an “insatiable appetite.”

“She’s really so sweet,” Panettiere told People. “I’m sure that’s the way it’s meant to be, because when they are putting you through the wringer you’re like, ‘You are so lucky you’re cute!'”

The pair shared the news of their engagement in October 2013 and announced the pregnancy last May.

Klitschko also shared pictures of the new family from an exclusive photo shoot by People magazine.