The West Wing star's son Emilio Estevez took to social media last week (ends18Dec15) to reveal his father was in recovery after checking into a hospital in Los Angeles for the preventative procedure.

"My Pop!" he wrote alongside a photo of Martin giving the thumbs-up from his hospital bed. "Successful proactive quadruple bypass surgery this week! A great Blessing indeed!"

On Wednesday (23Dec15), Emilio offered fans an update on his dad's progress by sharing a picture of the 75 year old from behind after being discharged from the medical centre.

"Look who got up and walked himself out of the hospital yesterday!" Charlie Sheen's brother captioned the Twitter post.

Emilio had previously assured devotees his dad's surgery had been a success and he would be back on his feet in no time.

"Not surprisingly, he is recovering beautifully, out of the ICU (intensive care unit) and is expected to not only be home for Christmas, but be 100% by the time he returns to work on season three of the Netflix series, Grace and Frankie early next year," Emilio wrote.