Former Beverly Hills, 90210 star Ian Ziering is a dad again after his wife Erin Ludwig gave birth to a baby girl on Thursday (25Apr13). The new arrival, Penna Mae Ziering, was born on her elder sister Mia Loren‘s second birthday. Ziering tells People.com, “We didn’t plan it! Mia was born a week late and Penna was a week early.” The actor’s newborn arrives as he prepares to become the latest celebrity to strip onstage in Las Vegas as part of the Chippendales revue at the Rio All-Suite Hotel and Casino. The 49 year old will join the show for four weeks from 6 June (13).