New mom Hayley Bieber has already accompanied her baby boy, Jack Bruce Bieber, to an important traditional event.

On Thursday, October 31, the model and Rode founder posted the first photo of her infant son since she and husband Justin Bieber welcomed their first child in August. She shared an adorable Instagram story featuring a close-up of the baby's tiny legs while sitting in a gray corset.

In the sweet photo, little Jack is getting into the spirit not for Halloween, but for the upcoming election. Instead of a Halloween costume, he is dressed in a bright magenta onesie with an “I Voted” sticker on one leg.

“Happy Halloween! Get out and vote,” Bieber captioned.

On August 23, Justin Bieber announced the birth of his baby by posting a photo on Instagram of Jack's newborn feet and his wife's hands (doing one of her signature manicures). In the caption, he wrote “WELCOME HOME” and introduced his son's name. Jack Bruce Beaver."

Haley then re-shared his post on her Instagram Stories, adding a teddy bear and a little blue heart.

The recent “I Voted” sticker shot is only the second newborn shot the couple has shared since his big debut.

In an interview with PEOPLE shortly after the Beavers welcomed their first child, a source close to the pop star confirmed that the couple is “overjoyed” with the new parents.

“The baby is so miraculous. He is adorable and doing well,” the source said. 'The pregnancy was something they had hoped and prayed for so much. The day they found out Haley was pregnant was Justin's best day ever. He was over the moon with excitement. It was a huge celebration for them."