Benteke's goal was his 19th since joining Villa from Belgian side Genk in August and Lambert dismissed concerns he might be tiring as a draining season reaches its conclusion.
He said: "He was brilliant.
"The one he has to please is myself.
"He was up there on his own. He has played every game for Belgium, Genk before we got him, and for ourselves - and he scores again.
"The guy has been absolutely brilliant. I don't think you can say he looked tired."