‘CSI’ STAR WILLIAM PETERSON WELCOMES TWINS

t's a boy and a girl for William Petersen.

The CSI actor, 58, and wife Gina Cirone welcomed twins via surrogate on July 5 in Los Angeles, PEOPLE confirms.

The pair were born prematurely, Petersen's rep says, but are steadily improving.

"The babies are doing great and are improving every day and we can't wait for them to come home," the couple, who married in July 2003, tell PEOPLE.