It's been reported that Aiba Masaki and his wife are expecting a baby! 

Aiba married a non-celebrity woman in September of 2021. According to the report by Josei Jishin, the couple avoided going out on dates over the ten years that they were dating. So Aiba decided to take his wife to Hawaii in mid-July for their honeymoon.

Aiba's wife was seen in Hawaii with a growing belly. Beside her was Aiba who seemed to take into consideration of her pregnancy like helping her walk down steps. Moreover, his agency has apparently confirmed the reports stating, "It's true." 

Aiba is the second member of Arashi to become a father following Ninomiya Kazunari who welcomed a baby girl in March of 2021. 

Congratulations!