Tom Hanks is officially a grandfather!

Tom's actor son, "The Good Guys" and "Roswell" star Colin Hanks, and Colin's wife, publicist Samantha Bryant, are now the proud parents of a baby girl named Olivia, sources tell TooFab.

This is the first baby for the couple, who married May 8, 2010 in a ceremony attended by Reese Witherspoon and Alyssa Milano.

The 33-year-old actor is Tom's son with first wife, Samantha Lewes.

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