Days before Mila Kunis is due to give birth, Ashton Kutcher's sister Tausha welcomed a baby boy, Us Weekly can confirm Credit: Jason LaVeris/FilmMagic

Mila and Ashton's baby girl will officially have a playmate when she arrives! Ashton Kutcher's sister Tausha welcomed a baby boy on Friday, Sept. 19, Us Weekly can confirm.

PHOTOS: Mila and Ashton's romance

Kunis, 31, and Kutcher, 36, flew to New Orleans to attend Tausha's wedding back in April. Before heading home, the parents-to-be stopped at Abita Beer Brewery for a tour.

The following month, Kunis — due any day now — bonded with her future sister-in-law while shopping in L.A. on May 16. The duo wore matching royal blue ensembles, which accentuated their growing baby bumps.

Kutcher's nephew and daughter will have plenty of family members gushing over them. His twin brother Michael shared some of their family traditions to Us Weekly in June.

"My mom [Diane] comes from an Irish Catholic background. She has 10 brothers and sisters, so we have a huge extended family. They're all around the same area," he explained to Us at the Harboring Hearts 2nd Annual Summer Soiree in NYC.

"I have a 9-year-old myself, and a 4-year-old, and there's a 16-year-old in the family," he added. "We're so excited to expand the cousins of the new generation."