The CSI actor recently proposed to actress LaNasa and the couple plan to tie the knot in the coming months.
"Katherine is very excited and already working on plans for the wedding that will happen later this year," LaNasa's rep told People in a statement.
The wedding will be the second for Show, who was previously married to Polyanna McIntosh. The pair divorced in 2011.
LaNasa was previously married to French Stewart and Dennis Hopper.
In March, Show was cast in Marc Cherry's ABC pilot Devious Maids.