The Baby Daddy star, who appeared alongside McEntire on The WB/The CW sitcom Reba for six seasons, gave an update on how the 60-year-old country superstar was doing at ABC's all-star summer TCA party on Tuesday.
On Aug. 3, McEntire and Blackstock announced in a joint statement on her website that they were splitting up.
"Despite this being the end of their marriage, they continue to support each other," the statement read. "They have worked together for 35 years and will continue to do so. They have asked that you respect their privacy during this time."
The pair have a son together, Shelby, a race car driver. Blackstock has three children from a previous relationship, including son Brandon, who is married to singer Kelly Clarkson.