Preheat oven to 350º F. Spray 10-inch Bundt pan with non-stick baking spray. Set aside.
Combine sugar and lemon juice in small bowl. Microwave on high for 45 seconds to a minute, until sugar has dissolved. Brush syrup over hot cake. Allow to cool completely.
Mix confectioners' sugar and lemon juice in a small bowl until smooth. Drizzle over cake, allowing glaze to drip down sides. Let stand until glaze sets, about 30 minutes.