Val Chmerkovskiy Can't Stop Gushing Over His 'Handsome' New Nephew Shai: He's 'Changed My Brother' Maksim

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Val Chmerkovskiy is one happy uncle!

The Dancing With the Stars pro was a guest on Good Morning America on Tuesday, where he couldn't stop gushing over his newborn nephew, Shai, his brother Maksim's first child with fiancée Peta Murgatroyd.

WATCH: Peta Murgatroyd Shows Off Her and Maksim Chmerkovskiy's Gorgeous Nursery, Gives Update on Baby Shai!

"[He's] amazing!" he dished. "Very handsome, like the parents."

The 30-year-old dancer also called baby Shai's arrival "a blessing," telling host Michael Strahan "it's changed the dynamic" of his family.

"It's changed my brother," he explained. "His name is Shai Chmerkovskiy, which is very unusual because this is the very first Shai Chmerkovskiy ever."

"I'm trying to be the best uncle I can be," he added. "I want to spoil him. I don't think he really understands much right now. But as soon as he's able to comprehend the love that he has around him, I think he's going to be a very spoiled young man."

WATCH: Maksim Chmerkovskiy Reflects on Fatherhood: 'I'm the Happiest Person That's Ever Lived'

Tuesday also marked Maksim's 37th birthday, so naturally, Val celebrated his brother's special day by posting a series of adorable throwback pics to Instagram -- 12, to be exact!

"To my brother happy birthday. We came a long way," Val captioned one of the pics, which featured the two sporting matching Christmas sweaters. "Love you @maksimc #happybirthdaymaks."

"Thanks for 'bearing' with me all these years, especially my super clever comedy," another hilarious post read.

See the rest of the snaps below!

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started.. #happybirthdaymaks

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our OTB phase. Welcome to America #happybirthdayMaks

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told our story... #ourwaytour #happybirthdaymaks

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Dear brother. sometimes I wonder like Stevie. Brother full of love like Philly. I know this might sound silly but, I know you gon feel me cause, you never disappear and When I call you're always near me. You are the roof, that kept me dry and when I asked to fly You took me underneath your wing And flew against the wind so high, I Never heard you say "That's mine" Cause you shared your love your time With me. Like all the time we'd be... Together. and even when apart you always had me in your heart I know, cause you there from the start till I'm under. Never wonder or doubt me. I know it's in me that..women always near me but you my blood Running in me flowing thru my veins like, rivers when it rains.. you did for me what Jordan did for Hanes... All jokes aside you always kept me by your side. forever grateful... I'll be like "check one two" And always be beside you. I love you. More than any verbal choreography can express. My gratitude to you is endless, and my ambition to return the favor will never subside. It's nice to say I made it, but it's a lot better to say that WE DID!! What's mine is yours. and always will be. #happybirthdaymaks

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WATCH: Val Chmerkovskiy Kisses Amber Rose at the Knicks Game, and It's Super Cute!

One day before his GMA appearance, Val attended a New York Knicks game with his girlfriend, Amber Rose. The pair sat courtside and even made it onto the jumbotron as part of a prearranged video segment called "Celebrity Row." The the 33-year-old model later called the moment "cute" via Instagram.

Watch below!