August 23, 2011 at 11:00 PM EDT

Former CSI star William Petersen and his wife Gina Cirone had a twin daughter and son on July 5 through a surrogate, reports People. The 58-year-old actor’s newborns were delivered prematurely, but are “doing great and are improving every day,” according to the couple. Petersen also has a 36-year-old daughter with two sons of her own.

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