Lance Bass Decorates Christmas Tree with Son Alexander as He Jokes 'Bombastic Side Eye Runs in the Family'

The singer shares his twins Alexander and Violet with husband Michael Turchin

Lance Bass is getting into the Christmas spirit with his little ones.

Over the weekend, the singer, 44, shared a photo on Instagram of him decorating the Christmas tree with son Alexander, 2. Bass holds his son with one arm, lifting him as Alexander turns his head to deliver a brooding side-eye look.

Bass follows suit, posing with his head turned to the tree and giving the camera a small side-eye.

"Bombastic side eye runs in the family… oh! and #ThisShirtSavesLives! Join me to support the kids @stjude," he wrote in his caption.

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Related: Lance Bass Says Twins 'Freak Out' When They Hear New *NSYNC Song on the Radio: 'It's Very Special' (Exclusive)

Bass shares his 2-year-old twins, son Alexander and daughter Violet, with husband Michael Turchin.

In November, the musician opened up about how special it's been to share *NSYNC's new music with his twins.

"It is very special. It was unexpected to be doing a song this year. It's been incredible. Unfortunately, we're not able to promote it or perform it, which is a bummer," he said. "But it's so great to be able to have something out there that my kids can enjoy."

Before recording the pop track "Better Place," for Trolls Band Together, Bass said, "I never thought that they would ever be able to see Dad on stage or hear a new song on the radio."

"So, when we're in the car and the song comes on and 'Better Place' is playing, they freak out and they're like, 'Ah!' And they know that that's Baba on the radio," he shared proudly. "It's special for me, for them to be able to hear that and see what Dad does. And, who knows? Hopefully, in the future, we'll get to give them a little more."

In May, Bass spoke exclusively to PEOPLE about how he's been getting outdoors with his twins. "We've been getting in a lot of core memories lately, that's for sure," he said. "Now that the weather's great, we're spending a lot of time outside."

To his parents' surprise, Alexander has been enjoying exploring playgrounds and slides.

"I thought he was too young for that but definitely not," Bass said. "He immediately went to the big boy slide and went head-first down. I can't believe he was that brave, but he loved it. I have a fearless boy on my hands."

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