Little Odin is growing up!
Odin Carter is turning those months into years!
Nick Carter celebrated his son's first birthday on Wednesday with an adorable Instagram pic of the little guy, captioned, "Happy birthday to my little boy. I love you Odin."
Aww!
Carter, who welcomed his little boy with wife Lauren last April, after the couple married in 2014, opened up to ET in February -- during the Backstreet Boys' "Larger Than Life" residency shows at Planet Hollywood in Las Vegas -- about how fatherhood has changed his life for the better
"He's just a bundle of joy and it melts my heart and gives me purpose and reason to keep on staying healthy, staying motivated and all of those things," Carter sweetly told ET. "He's a really good, solid thing for me to have in my life."
EXCLUSIVE: Backstreet Boys Talk Fatherhood and Seeing Nick Carter as a Dad: 'It's Trippy!'
Meanwhile, Odin's beach blond locks clearly take after his Backstreet Boys singer papa, though we're guessing the little guy doesn't get into as much trouble as his dad did back in the day.
Watch the video below to hear Carter talk about how his boy band's past antics would put Justin Bieber to shame.