On Monday, the rapper shared a tribute to the girl in a since-expired Instagram story in honor of her 14th birthday, according to People.
“Love you Nami! You one of the smartest, coolest people on [earth!]” he wrote. “The world is a much better place with you in it! Big 14!”
Big Sean also referred to Namiko as his “Anime plug” and a “newly big sis.” He and Aiko announced Friday that they had welcomed a baby boy, named Noah Hasani, on Nov. 8.
Aiko posted a note of her own over the weekend to celebrate Namiko, whom she shares with fellow singer O’Ryan Browner.
“Happy Birthday Namiko!” she wrote Saturday on Instagram, calling her the “most beautifulest girl in the world,” “the coolest person I know” and “my animal loving, actress, anime expert, rockstar, skater girl, artist.”
“I’m so proud of everything you are,” Aiko added.
On Friday, Aiko and Big Sean both posted a photo slideshow to Instagram capturing their hospital visit for Noah’s arrival. The rapper said in the caption of his post that the baby boy was “everything we could ever ask for and more.”
The longtime couple had previously shared pictures from a stunning nude maternity shoot back in July as they prepared to welcome Noah.