The 22-year old left-back has signed a three-year contract with Villa for an undisclosed fee and is looking forward to the challenge of stepping up to the Premier League.
"I've always believed that I could play in the Premier League and to have this opportunity with a club as historic and huge as Aston Villa and with a manager who is building a squad of young players with great prospects is tremendously exciting for me," Luna told the club's official website.
"I really can't wait to get started and to play my first game. I have a great expectation coming here.
"The manager explained to me that it is a young squad but also one with good experience and everyone is hungry, everybody wants to succeed here.
"There have been many good and great players from Spain who have come here and succeeded and I know I can adapt my game also.
"The quality of football in La Liga is also respected everywhere and this is why I believe I can do well in the Premier League."