Any day now Mila Kunis and Ashton Kutcher will welcome a baby girl into the world. Until then the engaged couple can dote on Kutcher's newest nephew. According to US Weekly, the actor's sister, Tausha, gave birth to a baby boy on Friday, Sept. 19.

Kunis, 31, and Kutcher, 36, were seen in New Orleans back in April to celebrate Tausha's wedding. A month later, Kunis and a still-pregnant Tausha bonded while shopping in Los Angeles. The future sister-in-laws even wore similar royal blue outfits.

Kunis, who announced her pregnancy over the summer, is due to give birth any day now. However, until the arrival of their little girl, the "Black Swan" actress and Kutcher are continuing on with their normal daily routines.

The couple was spotted grabbing a bite to eat Saturday night and Kunis is still attending her yoga classes.

"He is a nervous wreck," a source told People magazine. "They were hoping the baby would come this week because he's on hiatus [from his show 'Two and a Half Men']."

"He is incredibly excited for the baby," the source added. "Mila just wants the baby to come out already!"

To make sure his fiancée has a smooth delivery, Kutcher has "made a couple dry-runs to the hospital to see exactly how long it will take them to get there," a source told E! News.

"He's preparing for all scenarios and not leaving anything to chance," the source said. "He wants everything to go smoothly!"