Write SQL query to solve given problem: Among the players born in Whitestone, how many of them have won the MVP?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT COUNT(DISTINCT T1.playerID) FROM players AS T1 INNER JOIN awards_players AS T2 ON T1.playerID = T2.playerID WHERE T2.award = 'Most Valuable Player' AND T1.birthCity = 'Houston'